What qwen3.8-flash-next did

Let me look at the directory first, then build the game.

Twist idea: Let me think of something good and simple.

Ideas:
1. "Echo Shed" — every time you eat, a ghost of your past path... complicated.
2. "Shed" — press Space to drop a shed segment (trade length for space).
3. "Ripple" — eating food sends a shockwave that rotates food positions.
4. "Gravity Wells" — food drifts toward...
5. "Time Bank" — hold Shift to slow the tick but score less.
6. "Molting" — press space to shed your tail, becoming shorter but gaining a speed burst / scoring bonus multiplier that decays.
7. "Fork" — food comes in two types: red (grow 2, and grid shrinks?) 
8. "Orbit" — one wall is a portal every N seconds.
9. "Starvation" — the snake shrinks over time; eating gives 3 segments worth of "fuel". This makes it a real trade-off... actually a nice one: your tail burns over time, so you must keep eating. But that's arguably a mode not a twist.
10. "Rewind" — you have one undo per life.

I like a mechanic that creates a real decision at the moment of eating. Idea:

**"Ripen" / "Two-course meals"**: Each food exists in two states — ripe (1 point, grow 1) and unripe... hmm.

Better: **Phase Shift** — the snake alternates between solid and "phantom" phases; in phantom mode you can pass through yourself but score less? Too complex.

**"Echo Wall"**: the walls are shrinking. Hmm.

Let me pick something with a strong trade-off that's genuinely one sentence:

**"Bite the Tail" (Tail-Bank)**: Press Space to shorten your snake by one segment and instantly bank +2 points and refresh the whole board's food to a riper, higher-value state. Hmm too much.

**Simplest strong idea — "Shed":** Press Space to drop your tail tip as a permanent obstacle... no, that punishes.

**"Famine Feast" idea:** Food ripens. Every food on the board starts "green" (worth 1 point, grows you 1). If left uneaten for 3 seconds it "ripens" to gold (worth 3 points, grows you 2). The decision: eat now for safety, or wait for more points while the ripe one may become overripe and vanish? Actually simpler and clearer:

**Twist: "Ripen"** — Food ripens over time: fresh food is worth 1 point and grows you 1; if you let it sit it ripens to gold (3 points, grows 2) and then burns away after a while. Trade-off: greed vs. safety, and you might block your own path waiting.

Hmm, but that has two phases plus burn away. Explain in one sentence: "Food ripens where it lies — a meal is worth 1 point when fresh, up to 3 when golden, but it burns away if you wait too long."

That's a decent one-sentence rule. Interaction with growth: golden grows 2 segments. Dying/restart: reset all ripening. That works.

Alternative with more kinetic decision: **"Split Bite"**. Hmm.

Another idea I like more for gameplay depth: **"Coil" (Space = jump)**... no.

I think ripening food is good, readable (color + a ring gauge), and creates real decisions: do I detour to grab the gold one before it burns, risking the wall? Also creates the tension that the board could fill with burned-away food (no food left?) — need to keep at least one food present. Let's design carefully:

Ripen rules:
- There are always at least 2 "meals" on the board? Or 1? With one food, waiting means nothing to do but circle. Better: maintain 3 meals on the board at all times. Each has independent ripeness.
- Stages: raw (age 0–4s) = 1 point, +1 length. Ripe (4–8s) = 3 points, +2 length. Overripe/burnt (after 10s) = vanishes, and a new meal spawns elsewhere. Actually the burn is a natural renewal.

Value: shows as a small ring/pips. Colors: green → amber → red (dimming).

Speed: with 3 meals on a 24×24 grid, plenty of choice. This makes greedy routing meaningful: you chain gold pickups but risk a long path across the board into a wall.

Timer values need to be tuned to tick speed. Use seconds-based timers (delta time), independent of tick. Tick starts at 8 steps/s, speeds to a floor.

Let me define ripen timing in ticks-independent seconds:
- fresh: 0 → 3.2s (1 pt, grow 1)
- ripe: 3.2 → 6.4s (3 pts, grow 2)
- searing: 6.4 → 8.0s (1 pt, grow 1) — warning color, "still edible, worth 1, then it burns"
- burns at 8.0s, respawns fresh elsewhere.

Hmm — searing worth 1 same as fresh adds confusion. Simpler: value = 1 fresh, 3 ripe, and then it burns. Let's say fresh 0–3.5s (1pt, +1), ripe 3.5–7s (2pt... ) Let's do: fresh = 1 pt / +1, golden = 3 pt / +2, then burns at 7.5s. Warning flash after 6s.

Growth of 2 on golden: fine.

Score is "points" so eating gold gives 3. Good.

Also: "New food never appears on the snake" — enforced. And when food burns, spawn new.

Now, the requirement "Eating food grows the snake by one segment and scores a point" — with twist, golden grows 2 and scores 3. That's the twist modifying the base; acceptable since the twist is meant to change gameplay. But to stay comparable maybe keep base meal exactly 1 point/1 segment, and golden = 2 points/+1 segment? Growth is the snake-cost dimension. Hmm — the trade-off becomes purely score. I think growth difference adds meaningful trade-off (gold makes you longer faster → more dangerous). Keep golden = 3 points, +2 segments. And the base rule "eating food grows the snake and scores" is preserved in spirit.

Actually careful: a risk with 3 meals always present — the grid fills? No, meals don't accumulate; each is consumed or burns.

Let me now build a polished single-file page.

Design: dark CRT-arcade look, "VRAM Arcade". Canvas 720×720 CSS px, internal resolution scaled by devicePixelRatio. Grid 24×24 → 30px cells.

Rendering:
- Background grid subtle.
- Snake: rounded segments with gradient head-to-tail, eyes on head.
- Food: circle with ripeness ring gauge (arc showing time remaining), pips for value.
- Particle burst on eat (small, brief). Screen flash / score popup "+3".
- Grid shake on death? Keep subtle.

Tick loop: requestAnimationFrame with accumulator; fixed step dt = 1/hsp; clamp frame delta to avoid spiral. Speed: start 8/s, increase with score, floor tick length e.g. min 80ms? "floor on the tick length" → max speed. steps = 8 + growth*0.15 capped at 14 → tickLen = max(1000/14, ...). Implement: tickMs = Math.max(MIN_TICK_MS, 125 * Math.pow(0.985, totalGrown)) with MIN_TICK_MS = 62? Let's do MIN_TICK_MS = 70 (≈14.3/s). Fine.

Input: queue of direction changes (buffer up to 2), applied at next tick, reject reversal relative to last applied direction. Prevent default on arrows/space/P/Esc.

Pause on P or Escape, with overlay. Game over: show score, high score, restart on any key (any of a reasonable set — spec says "restarts on a keypress" — I'll accept Enter/Space/any letter/arrows, but require a small delay (300ms) after death to avoid accidental instant restart).

localStorage key: 'vram-snake-twist:highscore'.

Page layout: header with title + twist name, canvas, footer with controls and twist explanation. Must be visible "under the board".

Twist name: "Ripen". One sentence: "Meals ripen where they lie — fresh food is worth 1 point and one segment, but left alone it turns golden for 3 points and two segments, and burns away if you wait too long."

Also show live ripeness on board clearly.

Responsive: canvas CSS size min(720px, 92vw) but keep aspect square; internal buffer fixed at 720*dpr with logical coordinate mapping. Simpler: set canvas.width = canvas.height = 720 * dpr, ctx.scale, and CSS width 720px (max-width 94vw). Grid math in 720 logical units.

Handle dpr change / resize: recompute on resize with ResizeObserver? Simple: function fitCanvas() using CSS size to set backing store: use getBoundingClientRect → backing = rect.width*dpr, and scale = backing / 720 logical. Then ctx.setTransform(scale,0,0,scale,0,0). Good and crisp at any size.

Also add mobile touch swipe? Not required, but nice — optional, keep minimal (swipe steering). It's fine, small addition, not a second twist.

Death animation: brief flash of the snake, then overlay. Use state machine: 'ready', 'playing', 'paused', 'dead'.

Let's also handle: when dead, show overlay in DOM (or canvas). I'll draw overlays on canvas for a unified look plus DOM hint text. Simpler: DOM overlay absolutely positioned over canvas — easier for text. I'll use a DOM overlay div layered on the canvas with pointer-events none.

Ripen visuals: 
- Fresh: cool green/teal (#4ade80) with small stem, value pip "1".
- Golden: amber (#ffcc33) glowing, "3".
- Searing (last 20% of life): pulsing red/orange, "1" — hmm, decided value stays 3 until it burns? Let me make value = 3 while ripe until it burns. Simpler: value 1 fresh, 3 ripe, burns. No third value. Warning: after 5.5s it flickers to signal "about to burn".

Ripen timing:
- FRESH_TIME = 3.6s
- RIPE_TIME = 4.2s (so ripe from 3.6 to 7.8s)
- BURN_AT = 7.8s; warning at 6.2s.

Hmm, the ripe window is short-ish (4.2s) which is good tension. With 8 steps/s, 4.2s = 33 steps — plenty to travel.

Also: does the food age while paused? No — timers advance with game time only (accumulate dt only when playing).

Spawn: maintain MEAL_COUNT = 3. Spawn positions never on snake or on other food. If grid nearly full, pick random from free cells list.

Snake initial: length 3 (center-ish), moving right, head at (8,12) etc.

Self collision: standard — moving into body cells excluding tail (tail vacates unless growing). Implement: compute newHead; check wall; check occupancy of snake body minus last segment when not growing. Since growth is applied when eating (append duplicate tail), handle carefully.

Approach: snake array of {x,y} with index 0 = head. On step:
1. dir = next from queue.
2. nh = head + dir.
3. wall check → die.
4. eating meal? grow = meal.value.grow (1 or 2). pendingGrow tracked.
5. Determine body cells to check: all segments except those that will move off. If pendingGrow == 0 after this step... Standard technique: compute willEat; removeTail = (pendingGrow <= 0). Check collision against snake[0 .. len-1 - (removeTail?1:0)]. Then push head; if willEat pendingGrow += amount, else if pendingGrow>0 pop? Let's implement clearly:

```
const willEat = meal at nh;
const growNow = willEat ? (ripe? 2 : 1) : 0;
// body to check
const limit = snake.length - (pendingGrow > 0 ? snake.length : (growNow>0? 0 : 1)) ... 
```
Messy. Simpler: classic: if pendingGrow > 0, we don't pop; else pop tail. Order: push newHead first, then if not growing, pop tail. Collision check must exclude the tail cell that's about to be popped. So:

```
const growing = pendingGrow > 0;  // grow queued from previous eat (e.g. gold gives 2 => grow 1 now, queue 1 more)
```
Better approach: represent growth as a queue: when eating, pendingGrow += amount-? Actually growth amount of 1 = don't pop for 1 step; amount of 2 = don't pop for 2 steps. So:

```
// collision set = snake segments excluding tail if pendingGrow === 0
```
Wait but this step's eat also adds growth: eating a meal at nh means head goes onto meal cell; a meal is never on the snake, so nh isn't a body cell anyway. So collision only depends on prior pendingGrow.

Algorithm per step:
```
if (pendingGrow > 0) { pendingGrow--; /* keep tail */ }
const removeTail = (pendingGrowAtStart === 0);
check nh against snake[0..len-2] if removeTail else snake[all]
push nh
if (!removeTail) ... 
```
Let's write:
```
const keepTail = pendingGrow > 0;
if (keepTail) pendingGrow--;
// collision check
const checkUpTo = keepTail ? snake.length : snake.length - 1;
for (i=0;i<checkUpTo;i++) if snake[i]==nh => die
snake.unshift(nh)
if (!keepTail) snake.pop()
if (willEat) { score += val; pendingGrow += growAmount - 1; ... }
```
With growAmount 1 → pendingGrow += 0 (already grew this step). growAmount 2 → pendingGrow += 1 (grow again next step). 

Wait: if keepTail was true this step, we already didn't pop, so we grew by 1 this step. And eating adds more. Consistent.

Edge: eat while keepTail → net: pendingGrow-- then += (grow-1). Fine.

Score popup particles: array of {x,y,vy,life,text,color}.

Let me also add a subtle "trail glow" — keep performance fine.

Now write the code. Single index.html with inline CSS + JS. Should be ~600 lines. I'll write it in two chunks (write then edit-append) to be safe. Actually a single write of ~30KB might be okay but instructions warn; I'll do write + two appends via edit with a marker.

Let me write carefully.

Plan file structure:

```html
<!DOCTYPE html>
<html lang="en">
<head>
 meta charset, viewport, title
 <style> ... </style>
</head>
<body>
 <main class="wrap">
   <header>
     <h1>NEON SERPENT</h1> maybe "SNAKE" + twist badge
     <div class="scores"> SCORE / HIGH / SPEED </div>
   </header>
   <div class="board">
     <canvas id="game" width="720" height="720"></canvas>
     <div id="overlay" class="overlay"> ... </div>
   </div>
   <section class="twist">
      <h2>RIPEN</h2> <p>one sentence</p>
      <div class="legend"> fresh / golden / burnt chips </div>
   </section>
   <section class="controls"> keys list </section>
 </main>
 <script> ... </script>
</body>
```

Overlay content changes by state (ready/paused/dead). Use innerHTML swap.

Let's write CSS: dark background with subtle scanlines using repeating-linear-gradient (CSS only), phosphor glow.

Colors: bg #07090d, panel #0d1117, accent green #3ddc84 / #4ade80, gold #ffcb3d, red #ff5a5f.

Font: system monospace stack (no external fonts): ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace.

Now JS details.

Constants:
```
const GRID = 24, LOGICAL = 720, CELL = LOGICAL / GRID = 30;
const BASE_HZ = 8, MAX_HZ = 15 (=> MIN_TICK ~66.7ms);
tickMs(score) = Math.max(1000/MAX_HZ, 1000/BASE_HZ * Math.pow(0.986, totalGrowth))
```
Use totalGrowth (segments grown) as difficulty metric.

Ripen constants:
```
const FRESH = 3.6, RIPE_WINDOW = 4.2, WARNING = 6.4, BURN = 8.0 (seconds)
value: age<FRESH → 1pt/1seg; age>=FRESH → 3pt/2seg; age>=BURN → burn.
```

Food object: {x,y,age,born(at spawn time in gameClock),hue...}. Use age accumulated.

Game clock: gameTime += dt (seconds) only when playing.

Rendering the ripeness ring: arc around the food showing remaining time until burn, with the color changing; and a dashed marker at the FRESH threshold? Simpler & readable: ring fills down; when ripe, the food is bigger + glowing gold + ring turns gold; near burn, pulsing.

Let me draw food as:
- outer ring track (dark), progress arc = 1 - age/BURN.
- inner disc: fresh → radius 7, color teal-green; ripe → radius 10, gold, glow; warning → color shifts toward red and flickers alpha.
- value text (1 or 3) in tiny font in center? Might be cluttered at 30px cell. Instead show pips: fresh = 1 dot, ripe = 3 dots? Cute but noisy. Use ring color + size + subtle label. I'll put a small numeral using 9px monospace — at 720 canvas it's readable. Let's do numeral 1 / 3 in the disc in dark color. Yes readable.

Eat feedback: burst of 12 particles, expanding ring, score popup "+1"/"+3", and a brief global flash (alpha overlay) — plus optional navigator.vibrate? no. Audio: no assets but could use WebAudio oscillator for blip — that's allowed (no network). Add small blips via WebAudio created on first key press. Keep it optional and guarded in try/catch. That adds "feel good". Yes, add tiny sound with a mute toggle (M key). Hmm, keys used mustn't scroll; M is fine. But adding too much? It's fine, small.

Actually careful: sound requires user gesture; AudioContext created lazily on first input. Provide M toggle showing in HUD. Keep simple.

Death: flash red, snake segments flash white for ~400ms, then overlay with score. High score update.

Also "eating" should pause/slow briefly? A common juice trick: micro freeze-frame (hit stop) ~60ms. Implement: freezeUntil = now + 60ms — during freeze, no tick, but particles animate. Keep it tiny so it doesn't feel laggy. I'll skip hit-stop maybe... it can feel bad at high speed. I'll do a very small one (45ms) only for gold. Hmm, simplest: skip hit-stop, use a pop scale animation on the head and a ring. Let's do the ring + particles + popup + brief board glow pulse. Good.

Countdown "ready" state: start moving immediately on first arrow press? Spec doesn't require. State 'ready' shows "Press any key / arrows to start". Then first direction key starts game. Let's do: on ready, pressing a direction starts and sets direction (if not reversing — initial dir is right, so pressing left would reverse; ignore left, use... just start with default right and start moving on any key except Escape).

Let me define: startOverlay shown; any key (except Escape/M) → startGame() (keep the same snake). If the key is a valid non-reverse direction, set direction accordingly.

Restart from dead: same → resetGame() then state 'ready'? Spec: "A game-over state shows the score and restarts on a keypress, fully resetting everything." So keypress after death → full reset → playing (or ready). I'll go straight to playing for snappiness, with a 350ms guard after death.

Prevent scroll: keydown handler preventDefault for ArrowUp/Down/Left/Right, Space, and P/Escape keys, and WASD? WASD don't scroll. Space would scroll — prevent when game focused. Since game is the page, prevent default for those keys globally except when a modifier is pressed (allow ctrl+r etc.). Guard: if (e.ctrlKey||e.metaKey||e.altKey) return.

Touch swipe support: add touchstart/touchend on canvas → set direction, and preventDefault on touchmove over canvas to avoid scroll. Also tap to start. Add small on-screen hint? Not required. I'll include swipe (cheap).

Speed display: show "SPD" as HZ with one decimal or a bar. Show score, high, speed, and length.

Let me now also handle visibility change → auto-pause when tab hidden.

Time to write code.

Canvas drawing functions:

```
function draw() {
  ctx.setTransform(scale,0,0,scale,0,0)
  drawBoardBg()
  drawFood()
  drawSnake()
  drawParticles()
}
```

Board bg: fill #0a0e14; grid lines rgba(255,255,255,0.03); plus a vignette radial gradient; border glow drawn via CSS box-shadow on canvas.

Snake: draw as rounded path. For each segment i from tail to head: radius interp; color hsl interp from tail (#1f7a5a?) to head (#7dffb2). Draw rounded rect with corner radius 6 and small inset (1.5px) for segment look, plus head with eyes.

Better visual: draw a continuous body using path through cell centers with lineWidth ~22, lineJoin/lineCap round — but wrapping/self intersections fine since no wrap. That looks smooth and nice. However drawing path through centers when snake is length 1-2 ok. But corners look rounded — good. Use shadowBlur for glow. Then head disc drawn on top with eyes.

I'll do: 
- ctx.lineWidth = CELL*0.78, strokeStyle gradient along path? Gradients are linear in space; simpler: draw stroke twice: outer dark outline (lineWidth 26, color #0b3) then inner brighter (lineWidth 18). Then draw each segment as a small rounded square with interpolated color? Hmm, per-segment colors give a nice gradient tail.

Let's do per-segment rounded squares with color interpolation, inset 2px, plus connect by drawing the path stroke in a base color underneath to fill gaps. With inset 2 and 30px cells, adjacent squares overlap-ish (26px wide, centers 30 apart → 4px gaps). So draw the stroke path first at lineWidth 24 in dark green to bridge, then per-segment squares. Might look busy. 

Alternative cleaner: stroke path with lineWidth 24 in a solid mid color, then overlay per-segment light dots? Simplest good-looking: 
1. Path stroke lineWidth CELL*0.8 = 24, strokeStyle = '#123b2a' (dark body) with round caps/joins — body outline.
2. Path stroke lineWidth CELL*0.62 = 18.6, strokeStyle gradient from head gold-ish? No — head is green accent; food is gold. Keep snake cyan/green: '#39e07f' → tail '#1b6f4d'. Use createLinearGradient from head to tail bounding? Since snake curls, gradient won't follow. Use uniform color with per-segment circles fading toward tail: draw circles radius CELL*0.28 at each segment with alpha from head 0.9 to tail 0.15 in near-white for a spine highlight. That reads as gradient along body. Nice and cheap.
3. Head: circle radius CELL*0.42 fill bright #b8ffdc with glow, eyes two dark dots offset perpendicular to dir, plus tiny pupils.

Good.

Tail taper: also stroke a second pass with decreasing radius? Skip.

Death render: tint snake red-white alternating.

Particles: {x,y,vx,vy,life,maxLife,color,size} update in draw with dt stored globally.

Popups: {x,y,text,life,color} rising.

Ring pulse on eat: {x,y,r,life,color}.

Now write the HTML.

HUD: top bar inside .board? Keep HUD as DOM above canvas: SCORE big, HIGH, SPEED, LENGTH, SOUND toggle. Use DOM for accessibility.

Overlay: absolutely positioned covering board; state-driven.

Twist block below board (required): name + sentence. Controls block too.

Let me write it now. I'll write the file in 3 parts.

Careful about the tick loop:

```
let last = performance.now(), acc = 0;
function frame(now){
  const rawDt = Math.min(0.1, (now-last)/1000); last = now;
  ...
  if (state==='playing'){
     gameTime += rawDt;
     ageFood(rawDt);
     acc += (now - lastTick... )
  }
}
```
Use accumulator in ms: acc += min(rawDt*1000, 250); while(acc >= tickMs && state==='playing'){ step(); acc -= tickMs; } If state !== playing, acc = 0? For pause, reset acc to 0 on resume so no burst. Also cap iterations to e.g. 5 to avoid spiral (at 60Hz with 125ms tick, fine).

Freeze/hit-stop: implement hitStopMs; while >0 decrement and skip stepping (but still age particles). Food aging should also pause? Minor. I'll pause both food aging and stepping during hitstop for consistency (it's ~40ms).

Also flash effect timers use real dt.

Death detection at step: set state='dead', deathAt=now, update high score, spawn death particles, set acc=0.

High score localStorage with try/catch.

Let me write the code now, fully.

Also need "New food never appears on the snake" — spawnFood picks from free cells: build array of all cells not snake and not other food; if none, skip.

Meals: MEALS = 3.

Also, should meals be placed adjacent-ish to avoid impossible? random is fine.

Let me define value function:
```
function mealStage(age){ if (age < FRESH) return FRESH_STAGE; else if (age < BURN) return RIPE; }
```
with FRESH: pts 1, grow 1; RIPE: pts 3, grow 2.

Burn: age >= BURN → remove & respawn fresh elsewhere with a puff of smoke particles.

Draw ring: remaining = 1 - age/BURN. Track circle radius CELL*0.44 (13.2). Progress arc from -PI/2.

Fresh: age<FRESH → color '#5ef2a0'... Let's use: fresh '#57e08a' (green), ripe '#ffcb3d' (gold), warning (>WARNING) '#ff7043' with pulse.

Draw:
```
const r = stage==='fresh' ? 7.5 : 10.5 (plus pulse)
```
Plus numeral text 10px bold monospace, color dark (#06140c) centered.

Also draw a small glow with shadowBlur for ripe.

Now HUD speed: display "SPD 8.0→" as steps/s. Show as number with 1 decimal.

Also show LENGTH.

Write the CSS with nice arcade feel: title with letter-spacing and glow, panel with border, subtle scanlines overlay on board via CSS ::after with repeating-linear-gradient and pointer-events none.

Ensure canvas ~720 CSS px: `.board { width: min(720px, 92vw); aspect-ratio:1 }`, canvas 100%.

Resize handling: ResizeObserver on board → set canvas.width = round(rect.width*dpr) etc., scale = canvas.width / LOGICAL.

Let me write the files.

I'll write part 1: head + CSS + body HTML up to <script> opening with constants and state; part 2: game logic; part 3: input, loop, draw.

Actually the script content is long; write in chunks with a marker comment `/* --- APPEND --- */` replaced each time.

Let me write.

Key handling detail: `document.addEventListener('keydown', e => {...})`.

Keys to preventDefault: 'ArrowUp','ArrowDown','ArrowLeft','ArrowRight',' ','Space','p','P','Escape'. Also 'w','a','s','d' don't scroll but 'Tab'? no.

Direction map and queue:
```
const DIRS = {up:{x:0,y:-1},down:{x:0,y:1},left:{x:-1,y:0},right:{x:1,y:0}};
let dir = DIRS.right, queue = [];
function pushDir(d){ const last = queue.length ? queue[queue.length-1] : dir; if (d.x===-last.x && d.y===-last.y) return; if (d===last) return; if (queue.length<3) queue.push(d); }
```
On step: if (queue.length) dir = queue.shift().

Touch swipe: compute delta; if abs>24 choose axis.

Sound: 
```
let actx=null, muted=false;
function beep(freq, dur, type='square', gain=0.04){ if(muted) return; try{ actx ||= new (window.AudioContext||window.webkitAudioContext)(); const o=actx.createOscillator(), g=actx.createGain(); o.type=type; o.frequency.value=freq; g.gain.value=gain; o.connect(g); g.connect(actx.destination); const t=actx.currentTime; g.gain.setValueAtTime(gain,t); g.gain.exponentialRampToValueAtTime(0.0001,t+dur); o.start(t); o.stop(t+dur);}catch(e){} }
```
Eat fresh: beep(660,0.08); gold: two beeps 880 then 1320. Death: descending saw. Start: 440.

Only create AudioContext after a user gesture (keydown/touch) — call inside handler.

Now write everything.

Also: the twist name displayed: "RIPEN" with sentence. Also show a live indicator? The board shows it.

Let me produce the code.

For overlay markup:

```
<div class="overlay" id="overlay" hidden>
  <div class="ov-card">
     <div class="ov-kicker" id="ovKicker">READY</div>
     <h2 class="ov-title" id="ovTitle">SNAKE, RIPENED</h2>
     <p class="ov-body" id="ovBody">...</p>
     <div class="ov-hint" id="ovHint">Press an arrow key or WASD to start</div>
  </div>
</div>
```

JS sets kicker/title/body/hint per state.

Now the drawing of the "about to burn" warning could also dim the whole meal. Fine.

Write it.

One more: "the high score persists across reloads via localStorage" — key `vram.snake.ripen.highscore.v1`.

Also display "NEW HIGH SCORE!" in game over if beaten.

Let's write the file.

CSS length ~150 lines, HTML ~70, JS ~400. Write in 3 chunks.

Chunk 1: doctype → </style> maybe plus body html start.

I'll be careful with template literals in JS (fine).

Go.

Empty dir. Let's write index.html in chunks.

The twist: **RIPEN** — meals ripen where they lie.

Write part 1.

Now part 2: constants, state, game logic (spawn, step, eat, die, reset).

Now part 3: rendering, HUD sync, overlay, input, loop, init.

Rendering details:
- ctx.setTransform(scale,0,0,scale,0,0)
- apply shake translate
- draw board bg, grid
- draw meals with ripeness ring
- draw snake
- particles, popups, rings
- flash overlay

Also during DEAD state, keep drawing with time-based flicker of snake.

Let me write drawing.

For snake: build points from cell centers.

Death flicker: t = (now - deathAt)/1000; if flicker: alpha of body alternates. Use a red tint.

Grid bg: 
```
ctx.fillStyle='#080d14'; fillRect(0,0,LOGICAL,LOGICAL)
```
Add subtle checker: draw alternating cells rgba(255,255,255,0.012). 288 fills each frame — fine.

Grid lines: stroke thin lines rgba(255,255,255,0.028) at cell boundaries; use one path.

Vignette: radial gradient cached? Create gradient once per frame is okay but slight cost; cache in a variable created lazily.

Board edge inner glow: stroke rect.

Meals drawing:
```
for m of meals:
  const cx=(m.x+0.5)*CELL, cy=(m.y+0.5)*CELL
  const frac = clamp(1 - m.age/BURN_TIME, 0, 1)
  stage fresh/golden
  warn = m.age > WARN_TIME
  pulse = warn ? 0.75+0.25*Math.sin(now*0.02) : 1
  // dark socket
  ctx.fillStyle='rgba(255,255,255,0.04)'; circle r CELL*0.46
  // progress ring
  ctx.lineWidth=3; ctx.strokeStyle = ring color; arc from -PI/2, length frac*2PI
  // disc
  shadowBlur for golden
  fill circle r = fresh 7.5, golden 10.5 (+m.pop scale animation)
  // numeral
  ctx.fillStyle = '#06120c'; font bold 11px mono; textAlign center/baseline middle; fillText(pts)
```
m.pop: set to 1 at spawn, decays; scale = 1 + 0.6*pop ease? Let's: pop from 0→1 over 0.25s: scale = 1 - pop (start small). I'll store m.pop=1 at spawn, decay by dt*4, scale = 1 - 0.7*m.pop → starts at 0.3, ends at 1. Also alpha = 1-m.pop*0.6? Keep simple scale only.

Wait, I named `pop: 0` in spawnMeal; change to `pop: 1`. I'll handle in draw: use `m.pop` decay; but it was initialized 0. I need to edit spawnMeal: set pop: 1. I'll do that in a subsequent edit along with anything else. Actually easier: in the draw code, treat as `m.pop = (m.pop === undefined ? 1 : m.pop)`. Cleaner to just edit spawnMeal. Let me include an edit for that in the same edit call? Edits are matched against original file, non-overlapping — I can add an edit to change `pop: 0 }` → `pop: 1 }`. Yes, do it in the same call as appending part 3, since the two regions don't overlap.

Snake drawing:
```
const pts = snake.map(s => ({x:(s.x+0.5)*CELL, y:(s.y+0.5)*CELL}));
// head-follow offset for smoothness? Could interpolate with tickFraction for buttery motion.
```
Interpolated rendering: we could draw the snake offset by fraction of tick — nice but complexity: head interpolation into next cell while tail retracts. A common trick: keep prev positions. Simpler: render at discrete cells; the tick at 8-14Hz looks retro-appropriate. But "feel good to play" — smooth interpolation looks great but adds risk of weirdness. I'll do a modest trick: draw the head leading by up to 0.35 cell in the current direction based on tick fraction (visual only, so no collision confusion... but it can visually overlap into the wall/food cell slightly before actual move). Hmm at death boundary this might look off. Let's do: interpolate head forward by frac*0.5 and tail backward... risky with length 3. I'll skip interpolation — crisp retro steps, plus add a "squash" pulse on the head each tick (scale animation) which reads as responsiveness.

Actually a subtle and safe polish: draw the body path with round joins, and add a soft moving highlight. Good enough.

Snake body:
```
// outer
ctx.lineJoin='round'; ctx.lineCap='round';
path through pts
ctx.strokeStyle='#0e2f22'; lineWidth=CELL*0.86 (25.8)
ctx.stroke()
ctx.strokeStyle='#1f9d64'... 
```
Hmm gradient along body: to get tail fade, draw per-segment circles with alpha.

Plan:
1. stroke outer dark casing lineWidth CELL*0.84, color '#0b2a1e'
2. stroke inner lineWidth CELL*0.62, color '#27bd78' with slight glow (shadowColor '#4ce38f', shadowBlur 10 for body — but shadowBlur on long stroke each frame is a bit costly; it's fine at 720px)
3. spine highlights: for i, alpha = 0.35*(1 - i/len), circle radius CELL*0.16 fill white.
4. head: circle radius CELL*0.44, fill gradient (radial) from '#d8ffe9' to '#4ce38f'; eyes.

Death state: use red palette: outer '#3a1113', inner '#a3302c', head '#ff8f86', and flicker alpha via sin.

Eyes: perpendicular vector p = {x:-dir.y, y:dir.x}. eye centers at head + dir*0.10*CELL ± p*0.16*CELL, radius 2.6 dark '#07140e', with tiny white glint.

Rings (eat pulse): stroke circle r = CELL*0.4 + (1-life)*CELL*1.4, alpha life.

Popups: text rising: y -= 26*dt; alpha life. font bold 15px mono, stroke dark for contrast.

Particles: update pos, life -= decay*dt; draw squares (size) with alpha life, additive: globalCompositeOperation='lighter' for particles. Fine.

Flash: fillRect whole board with rgba(color) alpha flash*0.5 — use white-ish; on death red. Store flashColor variable? I'll compute: flashColor = '#ffffff' normally, '#ff5f57' on death. Set flashColor in eat/die... I set only flash numbers. I'll derive in draw: if state dead → red else white. Good.

Shake: shake decays; offset = shake * 10 * sin(t*60).

HUD sync: score/length/speed/high. Pop animation on score stat: add class 'pop', remove after animation (use a timeout, or remove on animationend). Implement: el.statScore.classList.remove('pop'); void el.statScore.offsetWidth; add 'pop'.

Overlay show/hide:
- READY: kicker "Ready", title "Ripen", body: sentence, hint "Press an arrow key or WASD", score hidden.
- PAUSED: kicker "Paused", title "Paused", body "Take your breath. Meals stop ripening while paused." hint "Press P or Esc to resume".
- DEAD: kicker "Game over", title "Game over" (class dead), body cause-specific ("You met a wall." / "You bit yourself."), score "Score N — High M", hint "Press any key to play again".

Init: high=loadHigh(); resetGame(); state=READY; showOverlay(); start rAF.

Input:
```
const KEYMAP = {ArrowUp:'up',ArrowDown:'down',ArrowLeft:'left',ArrowRight:'right',w:'up',s:'down',a:'left',d:'right',W:'up',...}
```
Use e.key.toLowerCase() and map w/a/s/d plus arrows.

Handler:
```
document.addEventListener('keydown', e=>{
  if (e.ctrlKey||e.metaKey||e.altKey) return;
  const k = e.key; const lk = k.length===1 ? k.toLowerCase() : k;
  const blocked = ['ArrowUp','ArrowDown','ArrowLeft','ArrowRight',' ','Spacebar','p','P','Escape','Tab'?]
  ...
})
```
Prevent default for arrows, space, p, escape, and w/a/s/d (harmless). Note: Escape preventDefault is fine.

Logic:
- audioOn() on first key.
- if key 'm' → toggle mute; footer update.
- if state DEAD: if now - deathAt > 400 → resetGame(); state=PLAYING? Spec says restarts on keypress, fully resetting everything. I'll reset and start playing immediately (also hide overlay). Any key except... let's accept all keys except modifier combos. But careful: the key that killed you might be held... fine.
- if state READY: any key starts; if it's a direction, set as initial dir (avoid reversal from right → ignore left; if pressed 'left', just start with right).
- if PAUSED: P or Escape (or any key?) resume. Spec: pause on P or Escape. Resume on same. I'll resume on P/Escape or any direction key (convenient).
- if PLAYING: 'p'/'Escape' → pause. Directions → queue.

Guard against restart with the exact same key that paused? Not needed.

Also auto-pause on blur/visibilitychange when playing.

Touch: on board touchstart record; touchmove preventDefault; touchend compute swipe → treat as direction key (and start/restart as appropriate).

Main loop:
```
function frame(now){
  requestAnimationFrame(frame);
  if (!lastMs) lastMs = now;
  let dtMs = now - lastMs; lastMs = now;
  if (dtMs > 250) dtMs = 250;      // clamp after tab-out
  const dt = dtMs/1000;

  updateEffects(dt);

  if (state === ST.PLAYING){
    if (hitStop > 0) hitStop -= dt;
    else {
      gameTime += dt;
      // ripen meals
      for (let i = meals.length - 1; i >= 0; i--){
        const m = meals[i]; m.age += dt; m.pop = Math.max(0, m.pop - dt*4);
        if (m.age >= BURN_TIME) burn(m);
      }
      acc += dtMs;
      let guard = 0;
      while (acc >= tickMs() && state === ST.PLAYING && guard < 6){ step(); acc -= tickMs(); guard++; }
      if (state !== ST.PLAYING) acc = 0;
    }
  } else {
    for (const m of meals) m.pop = Math.max(0, m.pop - dt*4);
  }
  draw(now, dt);
}
```
Note: while dead we don't tick. Good.

Careful: popups/particles update in updateEffects using dt — fine even when paused? On pause, effects freeze would be nicer but fine either way; they're short.

Also m.pop decay when hitStop — minor.

Let me write part 3 now.

One more: draw needs `frac` for anything? No.

Also: `spawnMeal(atRandomSpot)` param unused — remove to keep clean. I'll edit signature to spawnMeal() and calls. Calls: spawnMeal() in reset and eat/burn — all called with no args except reset passes nothing... In resetGame I call spawnMeal() — yes no args. And in eat I call `spawnMeal();`. And burn. So just change the signature. Include that in edit.

Now write drawing + input + loop.

Now let me review the file, check syntax, and test the logic headlessly with node (extract script and run a simulation with stubs). Let me first check syntax by running node --check on extracted JS.

Also note issues:
1. In `handleAction`, `if (e.repeat) return;` appears twice — one at the top already returns on repeat, so held keys never register — that's fine (turn on keydown only). Actually the first check `if (... || e.repeat) return;` means we don't preventDefault on repeats — fine since the first keydown already prevented it.

2. `drawEffects(dt)` declared with param dt but called without — fine.

3. `drawSnake` uses `dir` for eyes — during death dir remains. Fine.

4. `resetGame()` calls `syncHud()` which uses `high` — high is loaded before resetGame in boot. Good. But `syncHud` is defined later in the file; function declarations hoist, fine. However `el.statScore` etc. exist. Good.

5. In `die()`, called from step() — returns die(...) which returns undefined; step returns. Fine.

6. In eat(): `pendingGrow += grow - 1;` For golden: grow=2 → pendingGrow += 1. Correct since this step didn't pop tail? Wait: in step(), keepTail was computed BEFORE eating based on prior pendingGrow. If not eating/queue, keepTail false → tail popped → net growth 0 this step. Hmm! That means eating a fresh meal with pendingGrow=0 → we popped the tail, so length stays the same, and pendingGrow += 0 → the snake NEVER grows! Bug!

Let me redo: standard behavior: when eating, don't pop this step (that's the +1 growth). So on eat, we should keep the tail this step.

Fix: compute `keepTail = pendingGrow > 0 || meal !== null` — but the collision check must use keepTail too... Careful: if eating, the head goes onto the meal cell; if we keep the tail, the tail stays, meaning the body occupies one more cell. Collision check for nh: nh is the new head cell which is free (meal, not snake). So keepTail determination for collision doesn't matter for the current collision test (it's about whether the tail cell is excluded — the tail cell isn't nh anyway... could the tail cell equal nh? Only if nh is the tail cell — possible when snake wraps tightly? nh is not occupied by snake since a meal can't be on the snake. So if meal eaten, nh is definitely not any snake cell, including tail. So no collision either way.)

So restructure:

```
const meal = ...;
const keepTail = pendingGrow > 0 || meal !== null;
if (pendingGrow > 0) pendingGrow--;
const checkTo = keepTail ? snake.length : snake.length - 1;
... collision
snake.unshift(nh)
if (!keepTail) snake.pop()
if (meal) eat(meal)  // eat adds pendingGrow += grow - 1
```
Check: fresh meal (grow 1), pendingGrow 0 → keepTail true (eat), pendingGrow stays 0 (not decremented since 0). Length after step: +1 (head added, no pop). Correct: grows by 1.

Golden (grow 2), pendingGrow 0 → keepTail true, eat: pendingGrow += 1 → next step keepTail true, pop not called → +1 more. Total +2. Correct.

Edge: pendingGrow=1 (from gold) and eat fresh this step: keepTail true, pendingGrow-- → 0, eat → pendingGrow += 0 → 0. Length: +1 this step. Total gold earlier gave +2 across its two steps. Fine.

Edge: pendingGrow=1 and eat gold: keepTail true, pendingGrow-- → 0, then += 1 → 1. Good.

Now check `checkTo` when keepTail = true because of meal: checkTo = snake.length (all current segments) — the tail is not moving, so it should be included in the collision check. Correct.

When keepTail false: checkTo = length-1 (tail excluded, it will move). Correct.

Great — fix that.

7. Another bug: `spawnMeal` in resetGame is called before snake... no, snake is set first. Good. But spawnMeal filters head distance >3 using snake[0] — fine.

8. MEALS = 3 always maintained: reset spawns 3; each eat removes one and spawns one. Burn same. Good.

9. `freeCells` when snake huge: pool may be empty → uses free; if free empty return null → meals count decreases. Fine (win condition basically).

10. Overlay hint text: fine.

11. In `handleAction` for READY: `if (nav && nav !== "left") turn(nav)` — for 'left' at ready, we just start moving right. OK.

12. Pause via visibilitychange — while paused, `lastMs` continues; on resume we set lastMs = 0 in beginPlay so dtMs recomputed. Good. But when paused, the `else` branch runs each frame and lastMs updates → no burst. Good.

13. `hitStop` decrement: when hitStop > 0, we don't accumulate acc → fine.

14. `syncHud` speed uses tickMs.

15. Sound: audioOn called in handleAction before checking mute — audioOn returns if muted. If user unmutes later, first beep after that creates context? audioOn is only called on keydown... but muted toggle happens in handleAction which calls audioOn() at top when muted=true → returns early. Then unmuting: `muted=false` but actx null. Then subsequent keydown calls audioOn() → creates context. Fine.

16. AudioContext may start suspended; created within a user gesture handler → running. Good.

17. `const pts` — pts.length === 1 case: snake minimum length 3, fine.

18. In drawBoard the vignette gradient is created with ctx gradient object; caching across resize is fine (gradients are in user-space coordinates which are logical units). Good.

19. In `drawMeals`, `ctx.lineCap = "round"` persists into snake drawing where lineJoin/cap set again. Fine.

20. Popup: font set; textAlign persists. Fine.

21. `flash` overlay drawn after ctx.restore() → transform is still scale (save/restore inside draw preserves setTransform). Yes: save captured transform after setTransform, restore returns to it.

22. Death: state DEAD; the overlay shows immediately. But shake & flash fine.

23. Restart guard 420ms: after death, keys ignored until 420ms. Note `deathAt = performance.now()` and we compare performance.now(). Good.

24. `showOverlay` on DEAD: ovBody text "Walls are hard, tails are harder." — could use cause. Let me use cause-specific text: store lastCause. die(cause) sets el text. Minor nice touch: I'll add `deathCause` variable and text.

Let me implement: in die, set `deathCause = cause;` and in showOverlay use cause-specific. Need declaration in the let list. I'll add.

25. Requirement: "Score and high score are visible" — yes HUD.

26. Check BLOCK includes 'p','P' — I use lowercase check in the array `[\"w\",\"a\",\"s\",\"d\",\"p\",\" \"]` after `e.key.toLowerCase()`; for e.key === "P" (shift) lowercased → "p" included. Good. Escape in BLOCK. Space " " in BLOCK list too.

27. touchend calls handleAction(" ") on tap: in DEAD state → restart (guarded). In PLAYING, " " does nothing (nav undefined, not p/escape) → fine.

28. One more: on DEAD, any key restarts, including 'm'? handleAction returns after toggling mute for 'm' — that means 'm' doesn't restart. Acceptable ("restarts on a keypress" — mostly; mute is a global utility). Hmm, requirement says restarts on a keypress. Let's allow 'm' restart too? I'd rather: in DEAD state, restart regardless, but still toggle mute if 'm'. Simpler: move mute handling to also fall through? If we restart and mute, weird. Alternative: after death, if key is 'm' → toggle mute and don't restart (still a keypress, but the next keypress restarts). Risky for a strict reviewer but fine? To be safe: in DEAD state, if key is 'm', toggle mute AND restart? Then mute+restart simultaneously. Hmm.

Better: handle 'm' only when not dead:
```
if (lower === "m" && state !== ST.DEAD){ muted=!muted; updateFooter(); return; }
if (state === ST.DEAD){ ... restart }
```
And also add mute toggling on the READY screen. That satisfies "any keypress restarts".

29. `gameTime` unused except removed usage; it's fine (I removed birth). Keep.

30. In `eat`, we call syncHud(true) which updates high display.

31. newHigh resets on resetGame. Set true whenever score > high (during play) — the game-over overlay shows "New high score". Also if score surpasses high mid-game, `high` is updated immediately, so ovScore High shows the new one. Fine.

Now let me apply fixes: the keepTail/eat bug, deathCause text, mute-when-dead.

Then run a headless simulation test of the pure logic to verify growth and collision, by extracting the script and stubbing DOM? That's heavy. Alternative: write a small standalone node test replicating step logic? Better: run the actual file in a headless environment... no browser available presumably. Let me instead extract the script and evaluate with a jsdom-like stub I write manually (document/getElementById returning proxies, canvas ctx stub, requestAnimationFrame stub). That's doable and would catch runtime errors and let me simulate steps.

Let me do that after fixes.

Wait, edit #3: in `eat`, `mealStage(m.age)` after the meal is spliced from meals — m still exists as an object; but m.age hasn't changed, so stage is the same. But I introduced `void stage;` and recompute — that's silly. Actually original code was fine: `const stage = mealStage(m.age)` then `col = stage === ...`. But careful: eat() is called after the meal is still in meals (we splice inside eat). The stage const is computed at top from m.age — fine. My edit was unnecessary and makes it uglier. Let me revert edit #3 to the clean original.

Actually wait, there IS a subtle issue: in eat(), the order is: score, totalGrown, pendingGrow, splice, spawnMeal. Then hx/hy/col. m.age unchanged throughout. Fine. Revert.

Also I should double check `const pts` naming collision: in `drawSnake` there's `pts`, and in `freeCells` `out` — fine.

Let me revert edit 3 and then run a headless test.

Now let's test the logic headlessly. Write a test harness that stubs DOM + canvas + rAF, loads the script from index.html, and drives the game.

Harness plan (node):
- Read index.html, extract `<script>...</script>` content.
- Create a sandbox with vm module providing globals: document, window, localStorage, performance, requestAnimationFrame (capture callback, don't auto-run), ResizeObserver, AudioContext (undefined), Math, etc.
- document.getElementById returns a stub element object with textContent/innerHTML/hidden/classList{add,remove}/offsetWidth/addEventListener.
- document.addEventListener collects handlers (keydown).
- canvas stub: getContext returns a Proxy that accepts any method call and property set, plus createRadialGradient/createLinearGradient returning {addColorStop(){}}.
- getBoundingClientRect returns {width:720,height:720}.

Then: run the script; check state READY; dispatch keydown ArrowUp etc. Then manually drive frames by calling the captured rAF callback with increasing timestamps to simulate playing, and verify:
- snake moves, eats, grows correctly (score increments by 1 or 3, length increases correctly)
- meals never on snake
- food burns and respawns
- death on wall and self
- restart resets
- high score persists in localStorage stub

But to make the snake eat deterministically, I need to force meal positions. Since the sandbox exposes globals from the script (vm context with `var`-less const/let at top-level of script → they're context-scoped? In vm.runInContext, top-level `const/let` are script-scoped, not accessible via context object; `var` and function declarations become context props. My script uses `const`/`let` at top-level → not accessible. Workaround: append a line to the extracted script that exports the internals: e.g. append `\n;globalThis.__T = {get state(){return state}, get snake(){return snake}, get meals(){return meals}, get score(){return score}, get high(){return high}, get pendingGrow(){return pendingGrow}, setDir:(d)=>{dir=d}, resetGame, handleAction, step, ST, mealStage, freeCells, GRID, tickMs, get acc(){return acc}};`.

Yes. Let me write the harness in /tmp so as not to pollute the deliverable dir.

Careful: the script sets up `new ResizeObserver(fitCanvas).observe(boardEl)` — need ResizeObserver stub class.

Also `document.hidden`, `document.addEventListener`.

Let's write it.

Note: T.ST is an object; my assertions like `T.dir === T.ST` are junk (I wrote nonsense in a couple of places). Let me fix those before running: test 2 lines "queued turn applied" and "dir is right after queue" — those always pass, harmless but sloppy. Also `T.PAUSED` at test 11 (T has no PAUSED; T.ST does). Let me fix.

Also T.setDir takes a dir object; `T.setDir({x:1,y:0})`. Note in the vm, dir assignment via closure function works.

Fix test file items.

The 4th edit doesn't exist (my mistake — that text isn't there). The first three may or may not have been applied (the tool likely aborted the whole call). Let me re-apply first three only.

Also add Escape pause test.

Note the reverse-protection test: after ArrowUp started the game and tick applied up, then "ArrowLeft" then tick — dir becomes left. That test asserts alive. Need a proper reverse test: moving right (initial dir), press ArrowLeft before any tick → should be rejected. Let me restructure later; first run.

Also test 2 now ticks before the reverse test which changes context; the reverse test does `key("ArrowLeft")` when dir is "left" → same direction, ignored. Let me rewrite that test properly:

After the Escape-resume, dir state: started with ArrowUp (dir up after tick), then Escape twice. Now for reverse test: current dir is up. Press ArrowDown → must be rejected; tick; dir should still be up (y === -1).

Let me update.

Careful: at the start, snake is horizontal head (8,12) facing right with body to the left, length 3. Turning up is fine. Then turning left after moving up is fine (no self hit).

Test 6 stress: it forces meals[0] onto head.x+1 — but if dir is left (after test 5 I set dir right)... in test 6 loop, snake moves right into the forced meal. If the forced position is a wall cell (head.x+1 = 24) → wall death, loop breaks with state != PLAYING. The loop breaks and clean stays true. OK.

Run the test.

Let's analyze failures.

1. "queued turn applied -> up" — dir is right (1,0) after one tick. Why? Because `handleAction("ArrowUp")` in READY state calls `turn("up")` then `startFromReady()`. Then the first tick: step() does `if (queue.length) dir = queue.shift()`. So dir should be up... unless the tick used a stepMs of 125ms and only one 125ms tick happened? My tick() default step is T.tickMs() = 125ms, so exactly one step per call. Hmm, but acc accumulates: first frame after start has dtMs = clock - lastMs; lastMs = 0 was reset in beginPlay (lastMs = 0) → then in frame: `if (!lastMs) lastMs = now;` → lastMs = now, dtMs = 0. So the first frame after beginPlay consumes zero, meaning no step. Second tick call advances 125ms → one step.

So my test's single tick() didn't step at all. The dir is still right. That's a test artifact, not a game bug. But wait — is there an issue: beginPlay sets lastMs = 0 so the first frame after resuming computes dt from `now` → sets lastMs=now, dt=0. Good, no burst. Fine.

So test needs 2 ticks. Let me make tick() calls in the test robust: tick twice where needed.

2. "reverse rejected" — same artifact (dir still right because no step happened; then ArrowDown from right is a valid perpendicular turn... but it showed dir {1,0}). Let me restructure with extra ticks.

3. "perpendicular turn works" — lag by one frame; same cause.

4. "golden grow step 2": l0=4, now=5 — expected l0+2. Sequence: after the fresh eat test, length l0 read = snake.length (4?). Then I set dir, force golden meal ahead, tick() → eat: length +1 (keepTail) → 5. tick() → pendingGrow 1 → keepTail → +1 → 6. But it shows 5 after two ticks. Hmm, because of the one-frame offset: the first tick() may have done nothing (lastMs reset in beginPlay... no, beginPlay happened long ago; but each tick advances exactly 125ms and tickMs may be slightly less than 125 after growth (0.985^totalGrown) — that's it! After eating, totalGrown=1 → tickMs = 125*0.985 = 123.1ms. My tick() uses T.tickMs() at call time. So acc drifts and sometimes a step happens... wait, if stepMs decreases, acc accumulates surplus and sometimes 2 steps happen in one tick call. That would eat MORE, not less.

Actually let's trace: the golden meal was forced at head.x+1 in front. On the step where the head enters it, eat occurs (+1 length, pending +1). Then next step +1 → total +2. But maybe on the second tick, the snake ate ANOTHER meal (the 3 meals are on the board, and one randomly ahead?) — no, eating more would add more length, not less.

Hmm, l0 was captured before the first tick? Let me look: 
```
T.setDir({x:1,y:0});
head = T.snake[0];
forceMeal(head.x + 1, head.y, 5.0);
l0 = T.snake.length; s0 = T.score;
tick();
assert golden +3 -> PASSED, so the eat happened on that tick.
tick();
assert length == l0+2 -> got l0+1.
```
So after the eat tick, length = l0+1. Then the next tick should give +1 more. But if that tick didn't produce a step (because acc < stepMs due to the frame-offset/rounding), length stays.

Wait but the "fresh eat: length +1 total" test passed with one extra tick. Hmm — because after a step, acc remainder + next 125ms ≥ stepMs... Let's compute: my tick(msStep) default = T.tickMs() at call time. After the fresh eat, totalGrown=1, tickMs=123.125. tick(125) → acc += 125 → step, acc -= 123.125 → 1.875 left. So each subsequent tick of 125 produces 1 step and a slowly growing remainder — eventually 2 steps in a tick. Fine.

So why didn't the golden step-2 happen? Unless... the golden eat happened on tick #1, but the eat occurred during the SECOND step of that tick? No.

Hmm, maybe pendingGrow was already decremented: In step(), `keepTail = pendingGrow > 0 || meal !== null; if (pendingGrow > 0) pendingGrow--;` — eat() then does `pendingGrow += grow - 1` = +1. Next step: keepTail = true (pending 1) → pending 0 → no pop → length +1. So after 2 steps: l0+2. Unless the second tick produced no step at all.

Possibility: after the fresh-eat test, `tick()` was called... and in the golden test, before it, I called `forceMeal` and then `tick()`. But note test 5's `tick()` used `T.tickMs()` — after the first eat, totalGrown=1 → 123.1ms. But WAIT: test 4's final assert called `tick()` twice, then test 5 calls tick() twice more. Timing should be fine.

Let me debug rather than guess: add instrumentation. Actually simpler explanation: hitStop! On a golden eat, `hitStop = 0.045` (45 ms). During hitStop frames, the loop skips stepping and does NOT accumulate acc — but it also doesn't decrement acc. Each frame while hitStop>0 consumes a frame (125ms of my simulated clock) without stepping. So the golden bite "eats" ~1 frame. That's why step-2 didn't happen in the expected number of frames. That's intended behavior (juice freeze). So the test needs one more tick.

But careful: hitStop=45ms with frames of 125ms → one frame lost (45ms consumed by first check). Actually `hitStop -= dt` with dt=125ms → hitStop becomes -80 → done after 1 frame. So one frame lost = 125ms pause. Hmm, that's a longer freeze than intended at slow tick rates, since the frame length here (125ms) is my test's step size, not real 16.7ms. In a real browser, frames are 16.7ms so the freeze is ~2-3 frames ≈ 45ms. That's fine in reality.

But note: with dtMs clamped and acc not accumulating during hitStop, no drift. OK.

So the golden test just needs extra ticks. Fine — but let me double check that hitStop doesn't stall acc growth: acc stays constant, fine.

5. "burnt meal age reset" — I set meals[0].age = 99 and tick once; burn happens (replaced, count 3 passed) but "age reset" assert failed: `T.meals.every(mm => mm.age < 90)`. Hmm, meals[0] after burn is... burn() splices meals[0] out and pushes a new meal at the END of the array. So T.meals[0] is now the old meals[1] (age < 90). But wait, the assert checked every age < 90 — failed means one meal has age ≥ 90? Maybe the newly spawned meal replaced index 0... no, push adds at end. Hmm, maybe the burn happened but also... Actually `T.meals` getter returns the live array. After the burn, ages: [old1.age, old2.age, new.age]. Ages of old1/old2 grow by dt only (0.125). Unless... in test 6's stress loop I set meals[0].age = 4 each iteration — but that test ended. Hmm.

Wait — before test 7, `T.resetGame()` then `key("ArrowUp")` — if the state was DEAD at that point... Let me look at the sequence: after test 6's stress loop, the game probably died (state DEAD; loop breaks when state != PLAYING). Then test 7: `T.resetGame()` → state remains DEAD (resetGame doesn't change state!). Then `if (T.state !== T.ST.PLAYING) key("ArrowUp")` → in DEAD state, handleAction restarts (guarded by 420ms since deathAt) — deathAt was set at real Date.now() (performance stub) and `performance.now() - deathAt > 420` is false → no restart. So state stays DEAD and nothing ticks. Then meals[0].age=99 → in DEAD state no aging/burn happens. Then `tick()` → nothing (dead). "burnt meal replaced" passed trivially (count 3). And age 99 remains → assert fails. Also explains the later cascade failures ("restart works after guard" → dead, etc.).

Hmm, but "burnt meal replaced" passing is trivially true. So the failures cascade from my reset helper. Also note test 6 stress loop ended because state became DEAD? Then "no meal ever overlaps snake" passed because loop exited early.

Important insight: my test's `key("x")` restart attempts with clock advancing 500 use `clock` for the rAF timestamp but `deathAt` uses `performance.now()` → my stub is `Date.now()`, real wall clock, which barely moves during the test. So the 420 ms guard never expires in a fast test. I need to make the performance stub advance with the simulated clock. Let me set performance.now = () => clock (the simulated time). That makes the guard logic testable.

But careful: handleAction's guard uses performance.now(); my clock advances with each tick. I'll make the stub reference a mutable clock in the sandbox via a getter. Since vm context object property: `win.performance = { now: () => clock }` where `clock` is the harness variable — closures work across the vm boundary because the function is defined in the host. Yes, fine.

Also `Date.now()` is used in the touch handler only.

6. Test 9 "restart" — should now work with the clock-linked performance.now.

7. P pauses test — after fixing the cascade.

Also: "tight loop into body kills" passed but might have passed because state was already DEAD (the assert has `|| T.state === T.ST.DEAD`). Let me make that stricter: first ensure PLAYING and length > 5 before the loop.

Let me improve the test and re-run. Also add checks:
- After restart, high score kept in memory and storage.
- Golden meal shows value 3 & growth 2 (already covered).
- Speed increases with growth: check tickMs decreases as totalGrown grows — I can't set totalGrown from outside; skip or expose. I can simulate many golden eats... simpler: expose tickMs and compute manually. The formula test exists.

Let me rewrite the whole test file cleanly with a proper driver: helper `run(n)` that ticks n times using 16.667ms frames (realistic) and steps until state changes, plus helpers to force meals. Better approach: drive frames at 16.667ms and count steps implicitly.

Let me restructure the test file with a cleaner design:

- `frame(ms=16.667)` advances clock & calls rAF callbacks.
- `frames(n)` loops.
- `advanceSteps(n)`: run frames until snake head has moved n cells (tracking a step counter via snake moves) — simpler: run frames until the head moves, up to a cap.

Actually simplest: `awaitSteps(n)`: loop frames (16.667ms) and count head movement changes until n movements happen, with a safety cap.

Let me implement `steps(n)`:
```
function steps(n){
  let moved = 0, guardFrames = 0;
  let lastHead = T.snake[0].x + "," + T.snake[0].y;
  while (moved < n && guardFrames++ < 3000){
    frame();
    const h = T.snake[0].x + "," + T.snake[0].y;
    if (h !== lastHead){ moved++; lastHead = h; }
    if (T.state !== T.ST.PLAYING) break;
  }
  return moved;
}
```
Note length changes with growth also move the head; head movement is exactly 1 per step (unless dead). Good.

For growth checks use snake.length after enough steps.

Let me rewrite the test file completely.

Note: `T.mealPoints({age:0})` — mealPoints takes m and calls mealStage(m.age) — works with a plain object.

Run it.

Analyzing:

1. "golden meal: +3 points" s1=1, s=1 — no eat happened in 3 steps. Why? I did `T.setDir({x:1,y:0})` then `frontMeal(...)` which uses T.dir — the meal is placed at head+(1,0). But then steps(3): the first frame... Hmm, wait: in step 5 the state might be paused? No. Let's think: after test 4, the snake was heading left (dir left from test 3: turned left). Then T.setDir right — that's a reversal, but setDir forces it. Then frontMeal places the meal at head.x+1, head.y. Hmm, but that cell might be occupied by the snake body (segment behind the head when reversed!). Since dir was left, snake[1] is at head.x+1. So the meal is placed ON the snake. Then the head moving right into that cell = self collision → death! Then state DEAD, and steps returns immediately, score unchanged.

Actually "golden meal: +3 points" failed with score unchanged → the snake likely died. Then test 6's T.resetGame() recovered.

Test bug: I forced a reversal. Fix: instead of setDir, use key press for a legal direction and re-place the meal after dir settles. Better: place the meal relative to the actual movement by using a helper that ensures the target cell is free: find the meal slot; compute target = head + dir; if target occupied by snake, choose another direction. Simpler: use a `goRight()` helper that presses the appropriate arrow key (legal) and steps(1) so dir is confirmed right, then place the meal in front.

Let me write helper `face(name)`: map name to key, press it, steps(1) — but steps(1) moves the snake... Fine, dir is then applied. Careful about reversal rejection: if going left and wanting right, rejection → stays left. To make it robust, I'll press a perpendicular key twice? For test 5, use the current dir instead of forcing: `frontMeal` already uses T.dir, so just don't setDir. Place a golden meal in front of the current direction. That works regardless of orientation (unless the front cell is a wall — with dir left and head at x=8, fine).

So remove `T.setDir({x:1,y:0})` in test 5. But careful: frontMeal(T.FRESH_TIME+0.5) sets meals[0]; the head may eat a *different* meal on the way (other 2 meals could be in the path) → then score would jump by that meal's value and length differently. Test 4 had the same risk and passed. For robustness, let me clear the other meals' positions far away — put meals[1] and meals[2] at fixed safe cells not on the snake's path? Simplest: before such a targeted eat, set meals[1].age=0 and move them to the cell directly behind the head... could be snake. Let me instead pick a safe spot: compute a cell that's not on the snake and not in the direction path: e.g., find a free cell with x==head.x and y != head.y and not adjacent in the path. Simple approach: place them on the far column x = 0..2 region on the same row? Hmm.

Cleaner: make `frontMeal(age)` also relocate the OTHER meals to positions guaranteed not in front: I'll relocate all other meals to cells the snake currently occupies? No — must be legal-ish for invariants... For tests, invariant checks only run in the soak test. But burn/aging of the other meals could cause them to be eaten... they can't be eaten if they're behind walls of the snake.

Practical approach for test 5: move meals[1..] to the tail-side cells: place them at (0, 23), (1, 23) — bottom-left corner. Then the path in the current direction (whichever) can only hit them if the snake travels to the corner; with the head at ~x=7,y=13 moving left, meals at (0,23) aren't on row 13. But after the snake dies on the wall... The eat is immediate, 3 steps, so fine.

I'll make frontMeal put the other meals at (0, GRID-1) and (1, GRID-1) and give them age 0. But careful: if the head's path is leftwards and y == 23? Only if head y=23; the snake is around y=13/14 at that point (after 1 step up from 12... let's not worry).

Also must ensure those cells aren't on the snake — assert-free; if they are on the snake, no harm (they can't be eaten then).

2. "ageing is driven by game time" — after test 5, `T.resetGame(); key("ArrowRight");` — resetGame sets state? No, resetGame doesn't change state. After test 5, state = DEAD (from the reversal bug!). Then key("ArrowRight") in DEAD → the 420ms guard... clock has advanced plenty by then, so restart happens → state PLAYING. Then ages should grow. But ages were [0,0,0] after `frames(...)` calls — meaning the game was NOT playing during those frames. Hmm: `frames(Math.round((T.FRESH_TIME - 0.5) * 1000) / 1000 * 1000 / 1000 * 0)` → 0 frames (no-op, silly line). Then `frames(Math.round((T.FRESH_TIME-0.5)*60))` = frames(186) = ~3.1s. Ages ended at [0,0,0] → so no aging happened → state wasn't PLAYING.

Why? Because restart happens only when `performance.now() - deathAt > 420`; my performance stub returns `clock`, which only advances via frame(). After death in test 5, no frames ran before key("ArrowRight") → guard blocks → still DEAD. Then `frames(186)` advances the clock, but the key was already consumed. Then ages stay 0.

Test fix: after deaths in the test, always `frames(30)` (500ms) before pressing the restart key, or better define a helper `restart()` that frames(30) then presses a key and asserts PLAYING. Let me add `function revive(){ frames(30); key("Enter"); }` and use it.

Note also that `T.resetGame()` while state is DEAD/PAUSED leaves state — in the real game, resetGame is only called from restart() which then calls beginPlay(). To make tests simpler and the game more robust, I could make resetGame() set state = READY. That's harmless in the real code: `restart()` → resetGame() then beginPlay(). Let me add `state = ST.READY;` at the end of resetGame — it's cleaner semantically and helps tests. Careful: resetGame is called at boot before state assignment anyway (I set state = ST.READY after). Fine, add it.

Then in tests, `T.resetGame(); key(...)` → READY → key starts it. And in test 6 the `if (state !== PLAYING) key()` logic works.

3. "replaced meals start young" [7.85,7.85,7.85] — because the burn test ran while... Actually beforeBurn=3, steps(1) → but if the game was paused/dead... ages stayed 7.85 → no burn at all (count trivially 3). Because state wasn't PLAYING (cascade). Fix by revive helper + resetGame setting READY.

4. "was alive before the self-bite test" — cascade.

5. "P pauses :: dead" — cascade: after self-death... the self-bite test killed it, then `T.resetGame(); key("ArrowUp")` — with resetGame→READY this gets fixed.

Let me apply: (a) game: add `state = ST.READY;` in resetGame; (b) test: fix tests 5, 6, 9 to use a `revive()` helper and remove forced reversals.

For test 9 self-bite, ensure alive before: `assert("was alive before", T.state === S.PLAYING)`.

Also in test 9, after grazing 8 golden meals, the snake grows to 3+16=19; the seq loop with T.setDir forced — setDir bypasses reversal protection, which could reverse into the neck (that's a legit death but not from "turning into body"). To be strict: use `key()` presses for legal turns and force only when legal. With a long snake, a 4-step tight loop (right, down, left, up) at 2-cell radius... Let me instead do a controlled self-bite: force dir to a perpendicular (always legal, never reversal) and step 1; then force perpendicular again (turning back parallel to body) → the head enters a cell occupied by its own body if the snake is long enough. Classic: snake going right, length ≥ 5: force up (step 1), force left (step 2) — head is now at (x+1,y-1)... let's reason: head at H, body extends behind. dir right. Turn up: head moves to H+(0,-1); body now trails: [ (x,y-1), (x,y), (x-1,y), ...]. Turn left: head → (x-1, y-1). Is that occupied? Body has (x,y),(x-1,y)... not (x-1,y-1) unless the snake already curled. So a 3rd turn down: head → (x-1, y) → that IS occupied if the body occupies (x-1,y) — yes, when length ≥ 4. So: up, left, down → dies on step 3 (into the body at (x-1,y)). Each turn is perpendicular to the previous (legal, not a reversal) — good, and I use T.setDir which is fine here since these are all legal 90° turns.

So seq = [up, left, down] and the death must occur by step 3. But wait — after test 9's grazing loop, the dir at the end is whatever; and the head may be near a wall → wall death instead. To be safe: use resetGame then grow by grazing while staying centered? Simpler: allow either death but verify the death is "self" by checking... die(cause) sets deathCause internally but not exported. Let me export deathCause in the test exports and assert it equals "self". Good idea.

Also the grazing loop could hit a wall; I'll add a `keepCentered` approach: instead of grazing in a straight line, alternate directions... Alternative for growing: directly manipulate snake? I could push segments onto T.snake from the test (the getter returns the live array) — simplest & deterministic: `while (T.snake.length < 10) T.snake.push({...T.snake[T.snake.length-1]})`. Duplicated tail cells are harmless for a death test (they're body cells). But my soak invariants run separately. Then place the snake away from walls: I can also move the snake: set all cells x offset. Let me do:

```
function growBy(n){ for(let i=0;i<n;i++) T.snake.push({x:T.snake[T.snake.length-1].x, y:T.snake[T.snake.length-1].y}); }
function teleport(cx, cy, dirs){ // lay the snake out horizontally from (cx,cy) going right
  T.snake.forEach((s,i)=>{ s.x = cx - i; s.y = cy; });
}
```
Then self-bite test: head at (10,10), body extends left. dir right. Turn up, left, down → dies.

Check: step1 up: head (10,9). body: (10,9),(10,10),(9,10),(8,10)... (length ~10, tail pops each step). step2 left: head (9,9). body: (9,9),(10,9),(10,10),(9,10)... step3 down: head (9,10) → occupied by body → death by self. 

Wall-death test: head at (8,12) going right → after 15 steps reaches x=23 then next step → wall. Already works.

Let me now rewrite the affected test sections and add exports for deathCause.

Also remove the silly no-op `frames(...)` line.

For test 6 (aging), after resetGame (now READY) → key("ArrowUp") starts; but the head might hit the top wall in 3.1s (≈25 steps) → dies at y=0 after 12 steps... The head starts at y=12 → 12 steps up → dies around 1.5s. Then aging stops. Ages recorded: the meals at death have age ≈1.5 which is > FRESH_TIME - 1.0 = 2.6? No → fails. Fix: don't move — press a key to start, then... hmm, the game always moves. Alternative: pause after starting? Then ripening is frozen (by design). 

Better test for aging: start the game moving right from x=8 → 15 steps to the wall at ~1.9s. Not enough for 3.6s of aging. So instead measure aging over a shorter interval: run 60 frames (1s) and assert meals aged ~1.0s (all meals age by ~1.0). That directly proves game-time-driven aging. Then assert golden state via a forced age (already in test 7 with mealPoints/mealGrow). And "at least one golden by now" — I can age the board by playing in a circle... simpler: assert aging ≈ dt, then manually set the front meal to golden (test 5 covers golden eating).

So test 6 becomes:
```
T.resetGame(); key("ArrowUp");   // starts
frames(60);
ages ≈ previous + 1.0 (within 0.1)
```
But careful: starting moving up kills in 12 steps = 1.5s; 60 frames = 1.0s < 1.5s. OK, alive. Let me use frames(45) (0.75s) for margin. And the initial meal ages are 0 at t=0? resetGame spawns them at age 0. Then after 0.75s, ages ≈ 0.75. But wait, `beginPlay` sets lastMs=0 → first frame dt=0. Fine, ±0.02 tolerance.

Then burn test: set all ages = BURN+0.05, then steps(1) → replaced & young.

Let me also verify aging per-step: use steps(2) ≈ 0.25s.

Now implement changes.

Oops — I edited the wrong file: edits[1..] target /tmp/snake_test.js but I pointed them all at index.html. The first edit (resetGame state) may have been applied? No — the whole call failed since edits[1] didn't match; the tool reports failure of the call. Let me verify nothing changed in index.html and redo properly.

Good — index.html unchanged (line 805 is the boot line). Now apply edits to the right files.

1. index.html: add `state = ST.READY;` at end of resetGame.
2. /tmp/snake_test.js: fix tests.

Careful: `restart()` calls `resetGame()` then `beginPlay()` — resetGame sets READY, beginPlay sets PLAYING. Good. Boot: `high=loadHigh(); resetGame(); state=ST.READY; showOverlay();` still fine.

Now fix the test file.

Also test 12's soak presses "p" randomly which pauses; my soak handles pause via `key(pool)` — the game could stay paused for long stretches, that's fine but reduces coverage. Since pool includes "p","p" it toggles. OK.

Also test 12: when state is READY after restart? restart sets PLAYING. Fine.

Run again.

All 48 checks pass. Now let me verify the visual/HTML side:

1. Check the HTML file for completeness, no leftover markers, script structure.
2. Verify a "golden meal eaten" flow in the real browser? Can't run a browser; check for a headless chrome? Let me check if chromium/puppeteer exists — probably not. Let me check quickly.

Also let me do an additional check on the drift requirement: the accumulator approach is right. One more consideration: `lastMs = 0` in beginPlay then `if (!lastMs) lastMs = now` — good.

Another: in the frame loop, when paused, acc isn't accumulated (only in PLAYING). Good.

Let me also verify the "no network requests" — no external refs. Check HTML for http/src references.

Also confirm no `<img>`, no fonts.

Let me also visually inspect the drawing math for correctness at the boundaries: canvas CSS is 100% of a square board; internal size set from getBoundingClientRect width (square) — width and height both set to w. Since the board is aspect-ratio 1/1, rect.width == rect.height. Good.

Let me check for any potential runtime error in browsers: 
- `new ResizeObserver(fitCanvas).observe(boardEl)` — fine in modern browsers.
- `ctx.fillText` with the font string built via concatenation: `"700 " + Math.round(CELL*0.42) + "px " + "ui-monospace, Menlo, Consolas, monospace"` → valid.
- `el.statScore.offsetWidth` — fine.
- `audioOn` uses window.AudioContext.
- In handleAction, `performance.now() - deathAt` when deathAt undefined (state DEAD only set with deathAt) — fine.
- keydown listener: `document.addEventListener("keydown", handler, { passive: false })` — fine.
- The touch handlers with `{passive:true}` for touchstart and `{passive:false}` for touchmove/touchend — fine.
- `void cause;` in die() — fine (removes unused warning).

Let me now check the whole file for sanity: read it through. Also check that `flash` and `shake` are declared before use — declared in the `let` list. `particles/popups/rings` initialized in resetGame.

One issue: `updateEffects(dt)` runs before `resetGame` is called? No, boot order: high=loadHigh(); resetGame(); ... requestAnimationFrame(frame). Fine.

Another potential issue: `drawEffects` uses `ctx.textAlign` set to center; `drawMeals` also sets textAlign. Fine.

Potential issue: `drawSnake` uses `now - deathAt` for flicker; deathAt is undefined when not dead — but flick only computed when dead. `const flick = dead ? (Math.sin((now - deathAt) * 0.03) > 0 ? 1 : 0.35) : 1;` — fine.

Let me now also consider: on game over, the overlay covers the board; the death flicker is hidden behind the overlay. Overlay bg is semi-transparent (0.82-0.94 alpha) so the flicker is barely visible. Maybe delay showing the game-over overlay slightly (e.g., 450ms) so the player sees the crash. Let me implement: on die(), don't show the overlay immediately; instead show it in the frame loop once `performance.now() - deathAt > 420`. Also the restart guard is 420ms, so the overlay appears exactly when a keypress can restart. Nice.

Implement in frame(): 
```
if (state === ST.DEAD && !overlayShown && performance.now() - deathAt > 420) showOverlay();
```
Track with a flag `ovShown` set true in showOverlay/hideOverlay. Simpler: `let deadOverlay = false;` Set false in die(); in frame, if state DEAD and !deadOverlay && now-deathAt>420 → showOverlay(); deadOverlay = true. In restart()/beginPlay, set deadOverlay=false.

Since showOverlay is also used for pause, let me use a dedicated flag.

Also during the death delay, particles play — good juice.

Another polish: on the READY screen, the game is static (no motion). Fine — but maybe run a gentle idle animation? Not needed.

Let me also double check the eat feedback at high speed: flash 0.22 → decays at 2.4/s → ~90ms. Good.

Another consideration: the requirement "Score and high score are visible" ✓.

Now, the death flash color: in draw(), `state === ST.DEAD ? red : white`. ✓.

Let me implement the overlay delay and then do a final full read-through of the file.

Also let me reconsider one gameplay detail: MEALS=3 with ripening means the player can always find something; with BURN 7.8s and FRESH 3.6s, at 8 Hz (125ms), fresh window = 28 steps, total life 62 steps. Plenty of decision time. Golden window = 33 steps. Good.

Is the trade-off real? Yes: grabbing a fresh meal now (safe, short detour) vs. routing toward the golden one (3 pts but +2 length, and it may burn before you arrive, especially as the snake gets long and the path blocked). Good.

One more: should the golden also be riskier? It grows you 2 → faster self-trapping. Yes.

Let me make the edit for the delayed overlay.

Wait — `die()` sets deadCardShown = false, and resetGame doesn't touch it; but resetGame → restart → beginPlay sets false anyway. And boot: showOverlay() called with state READY — fine.

But there's a subtle issue: `showOverlay` in die path is now delayed; also the pause path uses showOverlay directly. Good.

Now re-run the tests to make sure the game-over overlay delay doesn't break my "game over state" tests (they only check state, not overlay). Let me also add a test asserting the overlay becomes visible after the delay. My element stubs track `hidden`. Let me add checks:
- after death + frames(40): els['overlay'].hidden === false
- during play: hidden === true
- during pause: hidden === false

Let me update the test and rerun. Also need to verify the game-over card shows the score text.

Additionally check: the "keypress after game over restarts" test presses Enter after frames(40) → overlay should be hidden again.

Let me add these assertions.

The overlay hidden check during pause: after `key("p")` the game shows the overlay — but in test 10, before pausing, T.resetGame() + key("ArrowUp"). resetGame doesn't hide the overlay; beginPlay (via startFromReady) hides it. So `hidden === false` after pause should hold.

But the boot-time check "overlay hidden while playing" comes right after restart → beginPlay hides it. ✓

Also the `ovScore` element: `els["ovScore"]` — created via getElementById in the script → yes, id "ovScore".

Run.

All 56 pass. Now let me verify the visual output actually renders. Is there a headless browser available? Let me check for chromium/google-chrome/playwright. If available, I could screenshot. Let me check.

Also: render a static preview of the canvas drawing by running the draw code in node with a canvas implementation? node-canvas isn't installed. Instead, I can verify the drawing math with a simple simulation: render the game state to an ASCII/text mock? Alternatively, generate an SVG snapshot by re-implementing? Overkill.

Let me check for a browser to screenshot with.

Chromium is available. Let me take a screenshot and check for console errors using chromium headless with --dump-dom? Better: use `--headless --screenshot --window-size=900,1200 file://...` and then view the image. Also check console errors: use `--enable-logging=stderr --v=0` and grep for errors, or run with `--virtual-time-budget`.

Let me do:
chromium --headless=new --disable-gpu --no-sandbox --hide-scrollbars --window-size=900,1180 --virtual-time-budget=2000 --screenshot=/tmp/shot1.png file://.../index.html

Then read the PNG. Also capture console errors via `--enable-logging=stderr` and grep -i "error\|uncaught".

Then a second screenshot after simulating key input? Can't easily send keys via CLI. But I can add a temporary query-param-driven autoplay? Alternative: create a temp copy of the page in /tmp that loads the same script? Simpler: use a small HTML wrapper in /tmp that iframes? File:// iframe of the game page, then script drives it — cross-file origin restrictions apply for file:// (each file is its own origin in Chromium; may be blocked). 

Better: run chromium with `--virtual-time-budget` plus inject a script? Chromium headless CLI can't inject JS. But I can use the DevTools protocol via a small node script using CDP over websocket... no ws module.

Alternative approach: make a temp test copy of index.html in /tmp with an appended driver script that dispatches keydowns and then screenshots after a virtual time budget. That verifies real rendering (canvas draw calls in a real browser). Then take screenshots at various virtual times. The driver: dispatch KeyboardEvent on document.

Let me do that: copy index.html to /tmp/game_shot.html and append a script:
```
<script>
 setTimeout(()=>{ document.dispatchEvent(new KeyboardEvent('keydown',{key:'ArrowUp'})); },100);
 setTimeout(()=>{ document.dispatchEvent(new KeyboardEvent('keydown',{key:'ArrowRight'})); },900);
 // also plant a golden meal for the screenshot
 setTimeout(()=>{ /* nothing */ },0);
</script>
```
With --virtual-time-budget=1500, the screenshot is taken after virtual 1.5s → the snake has moved ~10 cells.

Even better: also force one meal to be golden and one about-to-burn for the visual check. I can't access internals from an appended script (const scope)... Actually a later `<script>` in the same document doesn't share const bindings from the earlier script (top-level let/const are script-scoped, but they live in the global lexical environment shared across scripts!). Actually, top-level `const`/`let` in a classic script go into the *global lexical environment*, which IS shared across scripts in the same realm. So a subsequent script CAN read `meals`, `snake`, etc. Yes! Let me use that.

So the temp driver script can do: `meals[0].age = 5; meals[1].age = 6.9;` etc. Great for verifying the golden/warn rendering.

Let me build it with a python/node script that appends before </body>.

Steps:
1. node: read index.html, replace '</body>' with driver script + '</body>', write /tmp/shot_page.html.
2. chromium --headless=new screenshot at virtual time.
3. Read the PNG to inspect visually.

Also grab console errors.

Wait — the driver arranges meals at fixed cells, but the snake may occupy them (then the head would eat them, fine). Also meals placed on the snake violates the invariant only visually; acceptable for a screenshot. But careful: placing a meal on the snake and the snake moving onto it would eat it — fine.

Run mkshot then chromium.

No JS errors; game is playing (len 3, score 0 — the snake hasn't eaten yet, which is plausible). AudioContext warning is expected in headless with no user gesture (in real use, audioOn is called from a keydown so it's fine).

Let me view the screenshot.

I can't view images. I need another way to verify rendering. Options:
- Use chromium to dump a canvas "ASCII" representation: run a script that reads the canvas pixel data via getImageData after drawing and reduces it to text (e.g., a brightness grid), printed to console. That's a good programmatic check: verify that pixels of the right colors exist (green snake, gold meal, orange warn meal, HUD text drawn by DOM not canvas).

Let me write a probe script: after the game has drawn, sample the canvas and produce a coarse grid of characters based on dominant color per cell, printed via console.log, then grep from console log. With --enable-logging=stderr, console.log lines appear. Multi-line logs may be truncated per line but each line prints separately.

Better: write the ASCII map into document.title? Console log line by line is fine.

Probe:
```
const g = document.getElementById('game').getContext('2d');
const img = g.getImageData(0,0,cvs.width,cvs.height);
const step = Math.floor(cvs.width/48);
for rows... build chars by sampling: classify: gold if r>200,g>150,b<120; green if g>120 && r<140 && b<180; red if r>180 && g<120; dark otherwise → '.'
```
Print with a marker prefix so I can grep.

Careful: getImageData on a canvas that has been drawn — no cross-origin taint for file:// with no images. Should be fine.

Also I want to verify layout sanity (canvas is 720 CSS px, no overflow): use console.log of getBoundingClientRect values.

Let me build the probe.

Concerns: the probe script is a second classic script; it references `freeCells`, `snake`, `dir`, `pendingGrow`, `meals`, `score`, `totalGrown`, `syncHud`, `DIRS` — top-level function declarations and let/const from the previous script. Function declarations (freeCells, syncHud) go on the global object → accessible. `let`/`const` (snake, dir, meals, score...) are in the global lexical env → accessible from another script. But `snake` is a `let` binding — assigning `snake.length = 0` works (mutating, not rebinding). `dir = DIRS.right` — reassigning a `let` global from another script IS allowed (the binding is mutable, just not a window property). Should be fine.

`meals[0] = {...}` — meals is a const array; assigning elements is fine.

Also getImageData: canvas 2d context created without willReadFrequently — just a perf warning.

Also `state` — probe doesn't use.

Run it.

Interesting. The canvas is 718x718 backing at dpr=1 — hmm, CSS is 718 in the probe (the board CSS says 720 but 718 measured? `board css=720` but canvas css=718). Minor sub-pixel/scrollbar difference — actually the canvas is inside the board with 1px borders, so its width = 720 - 2*1 = 718. Fine.

The map is almost entirely "." — the whole board reads as dark, with just a snake hint at row 19 and faint marks. Something's off: with the probe forcing state, was the game actually still in READY (no rAF draws? no — draw always runs). Wait, rows show almost nothing: grid lines are `rgba(120,180,220,0.055)` → after averaging, RGB ≈ 8+ maybe 12 → below my thresholds. That explains "." for grid. The checkerboard and vignette are very dark too.

But where's the snake (row ~ (12.5/24)*36 = 18.75 → row 19 ✓ shows "####" at cols 10-13 → head at x≈10-13 region... yes the snake is there (y=12 → row 18-19). So the snake IS drawn (green detected). 

And the meals: gold at (16,6) → row (6.5/24)*36 = 9.75 → row 9-10; col (16.5/24)*36 = 24.75 → col 24-25. Row 09 shows all "." — the meal didn't draw? But there are "-" marks at random spots (row8 col7, row20 col12, row24 col30, row33 col27) — those are probably the meals' small discs at reduced brightness? Hmm, those are single "." → "-" cells.

Wait — my probe assigned `meals[0] = {...}` — `meals` is a `const` array, index assignment fine. But wait, at t=500ms the game might not have been running (state READY — no aging). That's fine; drawing happens regardless.

Hmm, but maybe the probe's meal objects lack the properties used in drawMeals... I set x,y,age,pop. drawMeals uses m.age, m.pop, m.x, m.y. Fine.

So why are meals invisible at this sampling? The meal disc is r ≈ CELL*0.26 ≈ 7.8 logical px (fresh) or 10.8 (golden) — in a 718px canvas. My sampling grid is 36x36 → each sample cell is ~20x20 px, and I average all pixels in it (stepping by 2). The disc covers ~π*10.8² = 366 px out of 400 → should dominate the average! So gold at (16,6): the cell center in the 36-grid... my row/col mapping: rows are sy = 718/36 = 19.9 px. Meal center = (16.5/24)*718 = 493.6 → col = 493.6/19.9 = 24.8 → col 24. Row = (6.5/24)*718 = 194.5 → /19.9 = 9.8 → row 9. Row 09 is all dots. So the meal did NOT render there.

Unless... the meal array got replaced: at 500ms, the game may have eaten/burned... no, in READY state, no updates.

OR: the probe script's assignment to `meals[0]` etc. didn't take effect because the game script's `meals` binding is in a different lexical scope? Both scripts share the global lexical environment, so it should work. Hmm, but did the probe script throw? Let me check the console log for errors — grep for "Uncaught" in /tmp/plog.txt.

Also, the "-" single cells could be from... hmm.

Wait: maybe the probe script ran BEFORE the game script (it's inserted before </body>, and the game script is also before </body> — the game script tag is inside .wrap? No, script is after .wrap and before </body>). The driver is appended right before </body>, so after the game script. Good.

But the setTimeout at 500ms — under `--virtual-time-budget=1500` timers fire in virtual time. The screenshot at virtual 1500ms. The probe's dump at 900ms. So both fired (dumps are in the log ✓).

So the meal assignments happened at 500ms (dump at 900 shows score=12, len=9 → the assignments DID work for snake and score). So meals were also reassigned. But then why no gold pixels?

Hmm! Maybe the canvas drawing was stale at dump time: the last draw happened... draw runs every rAF. In virtual time, rAF may run at a fixed rate — with --virtual-time-budget, rAF callbacks fire quickly. So the canvas should reflect the new meals.

Unless the canvas was blanked: getImageData on a canvas where the last draw call was... Wait, notice: the snake IS visible. So the draw included the new snake (len 9 at y=12) — the "####" at row 19 cols 10-13 only covers 4 columns of the ~9-cell-long snake (cols 3-10 expected). Hmm, the snake spans x from 2 to 10 → cols (2.5/24)*36=3.75 to (10.5/24)*36=15.75 → cols 4-15, but only cols 7-10 show "#". Partial because averaging with dark background dilutes.

So the meal discs (~10px radius, ~366px area within an 396px sample cell) — should be VERY visible. Unless the meal is small: golden r = CELL*0.36 = 10.8 logical → in the 718 backing px (scale ≈ 0.997) same. Area ≈ 366 px vs sample 396 px — should read as bright gold.

Unless drawMeals didn't run at all, e.g., `meals` at draw time was empty? Or an exception was thrown in drawMeals → which would break the rAF loop for subsequent frames! In `frame()`, `requestAnimationFrame(frame)` is called first, so an exception in draw wouldn't stop the loop, but it would leave the canvas partially drawn (board + snake drawn before meals? No — order: drawBoard, drawMeals, drawSnake. If drawMeals threw, the snake wouldn't be drawn and the board would show. But the snake IS visible → drawMeals didn't throw).

So maybe my classification thresholds: gold disc color #ffcb3d = (255,203,61) with shadowBlur glow. Average over sample cell: mostly disc → R≈200+, G≈170, B≈50 → my test: `R>170 && G>140 && B<130` → "G". Should match.

Hold on — the dark numeral text is drawn in the center; negligible.

Hmm, is it possible that the *probe's* getImageData returns an empty (transparent black) image because of `--disable-gpu` + willReadFrequently? No.

Wait — maybe the dump happened on a canvas that had only the FIRST frame drawn (before the meal assignment)? The snake drawn at y=12 with length 9 — the initial game snake is length 3 at y=12 (head x=8). Row 19 shows "####" spanning exactly 4 cells ≈ 4*20=80px ≈ 3-4 grid cells... that matches the ORIGINAL length-3 snake (x=6..8 → cols 9.75-12.75 → cols 10,11,12 + partial). The "####" is at cols 7,8,9,10 → hmm close to x=6..9. So the canvas shows the ORIGINAL 3-length snake, meaning the dump captured an early frame — but score=12 came from the DOM (post-assignment). 

So: the canvas at dump time reflects an early state → the canvas isn't being updated at dump time? That suggests rAF stopped being serviced in virtual time, OR... the meals at the time were fresh (age 0) → drawn green, small.

Let's test: at t≈16ms, `drawBoard + drawMeals(3 fresh green discs) + drawSnake(len3)`. Row 19 "####" = snake ✓; and the 3 fresh meals should show as green ":" or "#" somewhere (they're random). Row 20 col 12 shows "-" and ":" at col 13 — could be one fresh meal partially. But mostly the disc areas... hmm, fresh disc r=7.8 → area 191 px out of 396 → average brightness diluted by the dark background → green average ≈ (0.48*87) = 42 → my threshold G>105 fails → ".". Yes! That explains fresh meals being invisible in the coarse average.

And the golden meal at (16,6): if the canvas reflected the assignment, it would be big/bright. It's absent → so the canvas was NOT re-rendered after the probe's 500ms assignment.

Why? Because with `--virtual-time-budget`, after the budget the screenshot is taken; but rAF in headless with virtual time — rAF is driven by the compositor; in old-fashined headless "new" mode, requestAnimationFrame should still fire. But the dump at 900ms showed the snake as length 3 — hmm, but the DOM text showed score 12 because syncHud() updated the DOM directly from the probe.

Hmm, actually wait: `len=9` in the text probe! Yes: "score=12 high=0 len=9 speed=9.2". DOM shows 9. Canvas shows ~3-4 cells. So the canvas is stale relative to the DOM → rAF draws stopped long before (the very first frames).

So rAF is likely throttled/stopped in this headless virtual-time run (common: rAF doesn't fire without a real frame producer, or the game's `draw` only ran once at the start). That also explains: the first draw had the initial snake (len 3) and 3 fresh meals.

So the canvas probe is inconclusive for the meal rendering... but it does prove drawBoard + drawSnake + drawMeals(fresh) executed without error at least once, and the CSS/DOM is right (no horizontal overflow, 720 board, 5 control rows, heading text, rule text).

Better approach: instead of relying on rAF, call `draw(performance.now())` explicitly from the probe after arranging state (draw is a top-level function declaration → accessible). Then read pixels. Let me redo the probe:
- arrange state
- call `draw(Date.now())` directly (need the `now` param)
- then getImageData.

Also to be safe, use a finer sampling grid (48x48) and lower thresholds, and additionally count exact color matches (e.g., count pixels within tolerance of #ffcb3d, #ff8a5c, #57e08a, snake body #25b578, head glow #e6fff3, grid lines).

Counting pixels by exact color is much more robust than coarse averaging. Let me do that: report counts for each target color, and a bounding box of gold pixels to confirm placement.

Let me rewrite the probe with exact color histograms.

Note: `die` and `deathCause`, `state` (let, reassignable from another script), `ST`, `hideOverlay`, `draw`, `beginPlay`, `resetGame`, `syncHud`, `DIRS` — all top-level declarations of the game script, accessible.

Reassigning `state = ST.PLAYING` from another script: `state` is declared with `let` at top level of a classic script → it's in the global lexical environment → the second script can read AND write it. Yes.

Run it.

Analysis:
- golden: bbox 483-503 x 184-204, center (16.48, 6.48) ✓ exactly where expected, ~20px diameter (r≈10.8 → 21.6 diameter at scale 0.997 — close; the numeral covers the center so n=300 out of ~360 ✓).
- searing: center (5.48, 18.48) ✓ correct.
- fresh: color (87,224,138) matches with n=396 but bbox spans 250..620 x 362..620 — because that green is also used by the fresh meal ring color `rgba(87,224,138,0.75)`? The ring is drawn with alpha over dark → blended, not exact. Hmm, the wide bbox probably includes some anti-aliased snake colors? Snake body is #25b578 (37,181,120). The snake spine highlight uses "#c9ffe6" — no. The `n=396` matches a single disc (~396 px!) but bbox 250..620 is wide — meaning some pixels of that exact green also appear at x≈620,y≈620 (bottom-right = the fresh meal at (20,20) is at x≈(20.5/24)*718=613, y≈620 ✓!). And another cluster at x 250..? That must be part of the snake (spine/rim AA blending to exactly 87,224,138). So the fresh meal is at the right place plus a few coincidental AA pixels. Fine.
- snakeBody n=4000, bbox includes cols 2..21 rows 12..21 — again AA pixels near the meals' glow blend to that color; main body is at cols 2-11 row 12 ✓ (the headGlow at x 308-314, y 367-373 → cell ((308+314)/2/29.9 = 10.4, 12.3) ✓ head at (10,12) exactly as arranged).
- eyes: my "dark" predicate matched the whole dark background (8,21,15) ±14 — background is #070c12 = (7,12,18) → within tolerance. Not a real problem.
- coverage 2.9% lit — reasonable for a board with a thin snake.
- afterDie: state=dead, cause=self, overlay hidden (correct — delayed).
- afterRestart: playing, score 0, len 3, meals 3, overlay hidden ✓.
- storage: highscore=12 ✓ (persisted from the arranged score).

Everything renders correctly: meals positioned in the right cells with the right ripeness colors, head/body in place.

One thing to double check: does the *numeral* render? The golden disc had n=300 gold pixels out of ~360, meaning the center had the dark numeral — consistent.

Now, one issue found earlier: the canvas backing is 718 (board minus 1px borders) — the CSS is "roughly 720×720" ✓ (the board is exactly 720 including border; canvas 718). Requirement says "roughly 720x720 CSS pixels" ✓.

Now let me also confirm the real-time behaviour (rAF-driven) in a real browser environment. Headless virtual time didn't drive rAF, but that's a headless artifact. To double-check the game actually runs with rAF, let me run chromium headless with `--run-all-compositor-stages-before-draw`? Simpler: run without virtual-time-budget and instead use a probe that reports after real 1.5s using `--timeout`? With --screenshot and no virtual time, chromium takes the screenshot immediately.

Alternative: use `--virtual-time-budget` with `--run-all-compositor-stages-before-draw` to get rAF frames. Let me test whether rAF fires: add a probe that counts rAF invocations over virtual time. Actually I can verify the *loop* logic with the node harness (already done, 56 checks, including the 30k-frame soak). The browser rAF behavior is standard.

Still, let me try a real-play verification: run chromium in headless "new" mode with a screenshot after real time using a CDP-less trick: `--virtual-time-budget` doesn't drive rAF; but `--headless=new` with `--screenshot` and `--timeout=5000` may run for real 5s and then screenshot. Let me try: add a probe that dispatches keys on timers and reports state via console, and see the console log to know if the game advanced in real time (with `--timeout=3000 --screenshot`).

Let me try that with the first shot_page.html driver (which presses ArrowUp at 100ms and logs state at 1400ms) using real time.

No SNAPSHOT log. The `--timeout=4000` may screenshot at 4000ms but the driver's log used console.log at 1400ms... grep pattern issue: log lines look like `INFO:CONSOLE:830] "SNAPSHOT state=..."`. My grep -oE '"(SNAPSHOT|RAF).*"' should match `"SNAPSHOT state=playing len=3 score=0 errs=0"`. It returned nothing → so the console log didn't contain it, or the grep failed. Let me just cat the log.

The screenshot was written after ~1s (08:28:47.1 → 08:28:48.1), and the SNAPSHOT log at 1400ms didn't appear because the screenshot was taken at ~1s (timeout maybe interpreted differently). The AudioContext log at +0.9s means the game's key handler ran (audioOn from the dispatched ArrowUp).

Let me use a longer-running approach: use `--dump-dom` won't help. Let me use a driver that logs frequently (every 200ms) so at least one line lands before the screenshot finishes, and check whether the snake's head position advances over real frames — that verifies rAF+loop in a real browser.

Driver: log state/head/score at 200, 400, 600, 800, 1000 ms. If the head position changes across logs → rAF is driving the game in the real browser.

Let me create shot2 with that.

No output again. Hmm. Maybe the console messages are only flushed for the first ~1s, or the process exits. Let me capture everything and grep for RAF in the full log.

Actually in the previous run the log had entries up to +1s and then it wrote the screenshot. Here nothing matched — perhaps the run finished before 200ms? Or my grep pattern `"RAF[^"]*"` requires quotes... console messages appear quoted. Let me dump the tail of the whole log.

Only the AudioContext message appears (triggered by the keydown at 120ms → so timers DO fire and the key handler ran). But my RAF logs at 200ms+ don't appear... The AudioContext warning came from line 277 (beep/audioOn) — fired at 120ms.

So the console.log calls at t>=200 aren't logged. Why? Perhaps because after the screenshot is taken (which happens quickly, maybe at ~150ms?), the browser process exits. The screenshot in headless=new mode is taken after the "load" event + first paint, not after the timeout. That explains: everything dies right after the first paint (~150ms).

So real-time verification with headless chromium CLI isn't feasible. That's fine — the rAF loop is standard and the node harness validated the loop math.

Let me do a final verification of the loop's timing behaviour using the node harness (already covered: no drift by accumulator; 30k-frame soak at 16.667ms frames produced consistent meal aging and no duplicate steps).

One more specific requirement: "The tick loop must not drift or speed up on faster displays." Let me add an explicit test: run the soak at 8ms frames (125fps), 4ms (250fps) and 16.7ms (60fps) for the same simulated wall-clock duration and verify the number of steps is (nearly) identical, and identical to the expected duration/tickMs. Let me add that test — good check for drift.

Implementation: reset, then count steps by tracking head moves over 60 seconds of simulated time at different frame sizes, comparing counts. Because the snake will die (walls) during 60s, I need to keep it alive: I could avoid death by keeping the snake alive via... hmm, deaths complicate. Alternative: measure the *accumulated step count* directly rather than head movement: expose `stepsRun` counter? I don't have one. I can wrap: expose the internal acc? Simplest: patch the test to count head movements while repeatedly restarting on death (restart resets length, so tickMs stays at base → totalGrown resets too). But restart requires the 420ms guard; the total step count then differs slightly across frame rates due to the guard granularity.

Cleaner approach: measure the loop's step cadence directly in a controlled micro-test: temporarily expose a counter by instrumenting via the vm export: add to the export object a function that counts steps? Can't wrap step() easily (it's a const/let? It's a function declaration → I can override it from the driver script: `const orig = step; step = ...` — function declarations create bindings on the global object; the internal caller references the global binding? `step()` is called inside `frame()` — the reference resolves to the global var (function declarations at top level of a classic script go to the global object, and the function body's reference resolves at call time) → so overriding `step` from the appended script works!

So in the driver: 
```
let n=0; const origStep = step; step = function(){ n++; return origStep(); };
```
But wait, `die()` inside step... whatever, count all steps. Then to prevent death, also override `die` to no-op? If die is a no-op, the snake walks off the grid → freeCells/meal logic still fine, and step count continues. But drawing off-board is irrelevant for the count test. Also meals get eaten → pendingGrow. Let's just override die to a no-op and count steps for 60s of simulated time with different frame sizes. Expected ≈ 60/tickMs, with totalGrown rising as it eats (which is deterministic per step, not per frame) → the counts should be equal across frame sizes (±1 step of rounding).

I'll do this micro-test in a fresh vm instance so the overrides don't affect the main harness... simpler to do at the end of the harness (after other tests) since overrides would break later tests — do it last.

Let me add it as test 14 at the end.

Right — in the node harness the game runs inside a vm context, so `step` isn't a host-scope identifier; I must use `win.step` / `vm.runInContext`. Let me use `vm.runInContext` to install the overrides inside the context:

```
function installHooks(){
  vm.runInContext(`window.__hook = {n:0}; window.__orig={step:step, die:die}; step=function(){__hook.n++; return __orig.step();}; die=function(){return undefined;};`, ctxVm)
}
```
But `step` and `die` are function declarations at top level of a classic script → they become properties of the global object (window) — reassigning `step = ...` inside the context works and the internal call `step()` inside `frame()` resolves to the global property? `frame()` references `step` — the identifier lookup goes: frame's scope chain → global lexical env → global object properties. Function declarations at script top-level create properties on the global object (NOT the lexical env). So reassigning `step` (an unqualified assignment) inside a script resolves to the global object property → yes, frame() will call the new one. 

But careful: `die` is called from `step`; if I override both, fine.

Also careful: `resetGame` sets state; `beginPlay` etc. unaffected.

I need a handle to the vm context — currently I created it inline: `vm.runInContext(src, vm.createContext(win), ...)` — no saved reference. But `vm.runInContext(code, ctx)` where ctx = the contextified global object → I can use `vm.getContextObject`? Simpler: `vm.runInGlobal(code)`? Actually, once an object is contextified, `vm.runInContext(code, winObj)` works — the object itself can be used as the context proxy? `vm.runInContext` accepts a "contextifiedObject". Yes — `vm.contextify(win)` returns it and `vm.runInContext(code, win)` works since win was contextified by createContext(win) (the sandbox object is contextified in place). Let me just use `vm.runInContext(code, win)`.

Also note: functions defined via `function` in the script are on the sandbox object → `win.step` accessible from the host directly! So I can do `const origStep = win.step; win.step = function(){...}` — but does assigning to the sandbox object property update the global property visible to the script? The sandbox object IS the global object proxy in node's vm... Assignments to the sandbox from the host are visible to scripts running in that context (node docs: "the sandbox object ... properties are visible to scripts"). Yes, generally works (the contextify bridge keeps them in sync).

Let me use `win.step = ...` from the host and see if the count increases.

Rewrite test 14/15 with win.step / win.die.

Careful: my count override must be `win.step = function(){ count++; return orig.call(null); }`.

Let me patch the test file with python again (replace the broken block).

Cadence: 60fps → 243 steps vs 239 at higher rates over 30s. Spread of 4 steps out of 240 (1.7%). Why the difference at 60fps?

Because the tick speeds up with growth (the walker eats meals, totalGrown increases → tickMs shrinks → more steps). The number of steps depends on how many meals were eaten, and meal eating is deterministic-ish but spawn positions are random → different step counts. Actually the *step count* differs mainly because the speed ramp depends on meals eaten, and meals are random. Also 243 > 239 suggests slightly more growth → faster ticks. Also the last-frame rounding differs.

So this test conflates two things. A better cadence test: keep the snake from eating at all so totalGrown stays 0 and tickMs is constant at 125ms. Then steps over 30s should be ≈ 240 with ±1 per frame rate.

To stop eating: override `eat` to a no-op? Then the snake passes through meals without growth (and meals stay). Let me also keep meals off... simplest: override win.eat = function(){} so nothing changes speed. Then the step count is purely cadence: expected 240 for 30s at 125ms.

But careful: the `frame()` function of the harness has the initial `if (!lastMs) lastMs = now;` — beginPlay sets lastMs=0 → the first frame after start consumes 0 dt. So we lose ~1 frame of accumulation per run — same across rates. Also dtMs clamping (>250ms) doesn't apply at these frame sizes.

Expected count = floor(30000/125) = 240, with accumulator remainder effects: the very first frame loses one frame interval (16.7 vs 4.2 ms) → the difference in step counts across frame rates ≤ 1. Let's see.

Let me update: also override `eat` to a no-op in frameRateTest, restore after.

Note the accumulator is exact: acc += dtMs, subtract tickMs. Floating-point accumulation is fine.

Let me patch.

60/60 pass. 239 steps in 30s at every frame rate (240 minus the one frame lost at start-up) — identical cadence across 60/120/144/240 fps. 

Now let me do the final read-through of index.html to confirm completeness and consistency, check for leftovers, and verify no external resources.

Let me read the file in full (it's ~870 lines?). Let me check size and read.

No external references, no leftover markers, script parses. Only index.html in the dir (plus .session which was pre-existing).

Now let me read the file to verify consistency between sections — particularly the HTML and the JS references to element IDs.

Let me read parts: the HTML body region and check IDs used in JS exist.

All IDs used in JS exist in HTML. `statHigh` is unused in JS (harmless). No querySelector in index.html (the grep for querySelector was in my probe, code 1 because no match).

Now let me read the JS in full to sanity check the final file (I wrote it in chunks and edited several times).

Looks good. Note `new ResizeObserver(fitCanvas).observe(boardEl)` runs at parse time before the DOM? The script tag is at the end of body, so DOM elements exist. ✓

One thing: `spawnMeal` requires `snake[0]` — in resetGame, snake is filled before spawnMeal ✓.

Let me continue reading the rest to double check.

All consistent. One detail: `const checkTo = keepTail ? snake.length : snake.length - 1;` — when keepTail because of `meal !== null` but pendingGrow is 0, `checkTo = snake.length` includes the tail (correct, tail doesn't move).

Wait, subtle bug possibility: when eating, we keep the tail, so the tail cell remains — and the check includes it. Correct.

But hmm, one subtle case: eating while `pendingGrow > 0` → `if (pendingGrow > 0) pendingGrow--` happens BEFORE the collision check but that doesn't affect the check. ✓

Now, a design question about the "newHigh" flag: it's set when score > high during play; then high is updated. On death, `if (score > high)` is false (already equal) so newHigh stays from the eat. ✓ If the player scores 0 (dies immediately), newHigh false ✓.

Let me read the rest (476-818) to double check the input section and boot.

Everything looks complete and consistent. A few remaining considerations:

1. The `keydown` handler's preventDefault list: `["w","a","s","d","p"," "]` — plus BLOCK. Note "Escape" prevented — could interfere with exiting fullscreen in some browsers? Escape's default in fullscreen isn't preventable via keydown in most browsers anyway (Chrome allows Escape to exit fullscreen regardless). Minor. It's fine.

2. Potential issue: pressing "m" when READY toggles mute and returns — fine.

3. `if (e.repeat) return;` twice — harmless duplication. Let me clean that up (remove the second).

4. Game over → "press any key" — if the key is F5/Ctrl+R we return early (modifier guard) ✓.

5. There's `const cvs` shadowing nothing. ✓

6. One gameplay concern: the tick speed ramp uses `totalGrown` which resets each game — good.

7. `gameTime` is only used to... nothing now (leftover). Harmless but let me leave it (it documents game time) — actually unused variables are fine but let me just leave it; it's used in `gameTime += dt`. It's not read anywhere. Fine, no harm. Actually let me keep it simple and leave.

8. Auto-pause on blur: on mobile/desktop when clicking outside. Note: this fires when the window loses focus, e.g. after clicking dev tools. Fine.

9. The requirement "Keys used by the game must not scroll the page" ✓ for arrows/space; also touch: touchmove preventDefault on board, and `touch-action: none` on .board ✓.

10. The twist name/description printed under the board ✓ (in .panel below the board: "The twist — Ripen" + sentence). Also on the start overlay.

Let me do the small cleanup (duplicate e.repeat) and then a final full-file parse + rerun of the test suite. Also I should double check the `die` "wall" path: `return die("wall")` — die returns undefined; step exits ✓.

One more potential polish: `handleAction` READY state ignores Escape — good (Escape shouldn't skip). 

Also `startFromReady` and `beginPlay` duplication: startFromReady just calls beginPlay. Fine.

Let me also consider: after game over, pressing "m" restarts (since the mute branch is skipped when dead). Reasonable.

Final cleanup edit + rerun tests.

Also let me reconsider one gameplay nuance for feel: with 3 meals always present and burns replacing them, the board always has options — good.

Let me apply the cleanup and rerun.

Wait: `e.preventDefault()` inside the handler with `{passive: false}` — fine. But there's an issue: preventDefault is now called before the `if (e.repeat) return;` guard was removed — actually the repeat guard is at the top line: `if (e.ctrlKey || ... || e.repeat) return;` which happens BEFORE preventDefault. So on key repeat, we return early without preventDefault. Is that a problem for scrolling? Yes! For held arrow keys, the first keydown is prevented (no scroll) — but repeat keydown events also trigger scrolling in some browsers? Since the initial keydown was prevented, held keys don't scroll (scrolling on hold is triggered by the default action of keydown events, including repeats). Hmm, to be safe, preventDefault should also run on repeats. Let me restructure:

```
document.addEventListener("keydown", (e) => {
  if (e.ctrlKey || e.metaKey || e.altKey) return;
  const isGameKey = BLOCK.includes(e.key) || ["w","a","s","d","p"," "].includes(e.key.toLowerCase());
  if (isGameKey) e.preventDefault();
  if (e.repeat) return;
  handleAction(e.key);
}, { passive: false });
```
That's cleaner and safer. Let me apply.

Now let me add a test for preventDefault behaviour (that game keys are prevented and that browser shortcuts like Ctrl+R are not intercepted), then rerun everything.

Test: create an event object with preventDefault flagging; press "ArrowUp" → defaultPrevented true; press "Tab" or "F5" → false; press "Ctrl+R" → handler returns early (no preventDefault) — my test harness passes ctrlKey.

Also verify that a held arrow key repeat event still gets preventDefault (e.repeat true → prevented but not handled: assert that the snake direction queue doesn't change on repeat but prevented = true).

Let me add test 16.