I added the football stadium level as levels/football-stadium-4f5d.js. It's the only file I added or changed. node tools/validate-level.mjs levels/football-stadium-4f5d.js exits with code 0 and prints ok … "Football stadium", 30 snacks, +20%, Football.

The level:

• Name, cue and numbers: the name is "Football stadium" and the cue is "Clear the pitch". start is 30 and speed is 1.2 (20% faster).
• Weapon: named "Football". It's a slow single shot with a big hit area: reload: 0.7, auto: false, pellets: 1, radius: 1.8, recoil: 0.6, sound: "shot", a ring reticle and a white tint.
• The room: it uses the same shape as the built-in rooms and starts from examples/flooded-arcade.js.
  • Back wall: rows of fans in coloured shirts, a row of advertising boards, a goal with a net, and a glowing "HOME 2 - 1 AWAY / 88:00" scoreboard.
  • Side walls: more fans and a twinkling floodlight on each.
  • Ceiling: a steel roof over a night sky. The middle is left clear for the bulb and the hamster wheel.
  • Floor: striped grass with white markings: the touchlines, the halfway line, the centre circle and a penalty box.
  • Leak: a long iron pipe under the roof with a rusty joint above k.DRIP. It sets k.G.dripX, k.G.dripY and k.G.pr the same way the example does.
• Text: everything in the file is family-friendly and has no links.

How I checked it: I installed @napi-rs/canvas only in test/scratch/ and used tools/preview-level.mjs to render the room at both test screen sizes (desktop 1440×900 and phone 390×844). On the phone size the scoreboard text spilled out of its box, so I capped the font size to the box width and rendered it again. It fits now, and the drip point shows under the pipe joint on both sizes.

What I didn't do:

• I didn't add the level to levels/index.json. LEVELS.md says the game's operator does that after a review.
• I didn't set the optional order field. The validator accepts it, but LEVELS.md doesn't describe it, the task didn't ask for it, and it needs a job ID I wasn't given.
• I didn't commit anything.

I found no defect that should block the level levels/football-stadium-4f5d.js. I recorded one cosmetic, info-level note in .imd-findings.json, and I changed no tracked files.

What I checked:

• Order values: start: 30, speed: 1.2 (20% faster), name "Football stadium" (16 characters), cue "Clear the pitch". The texts are family-friendly with no links. The weapon is named "Football" and uses only fields from LEVELS.md, all within their ranges: a slow single shot (reload 0.7) with a large hit area (radius 1.8) and a ring crosshair. That fits a kicked ball.
• Validator: node tools/validate-level.mjs prints ok. The commit adds only that one file, and levels/index.json is untouched.
• Rendering: I rendered the room at 1440×900 and 390×844 with tools/preview-level.mjs. It clearly reads as a stadium: stands full of fans, a scoreboard, advertising boards, a goal, a striped pitch with markings, floodlights and a roof. The back wall, side walls, ceiling and floor follow the geometry in LEVELS.md. The leaking pipe and its rusty joint sit over k.DRIP, the drip point is on screen, and the area around k.BULB is clear. The scoreboard text was missing from my render, but only because this machine has no fonts installed. The example level's text would be affected the same way.
• Other screen sizes: I also ran the painter at seven sizes from 100×100 to 3840×600. It never threw an error or passed a non-finite number. It made 1,221 to 6,149 drawing calls (the allowed range is 40 to 120,000), with 3 glows, 6 lights and a pipe radius above 0 every time.

The one note (info, levels/football-stadium-4f5d.js:70): each floodlight tower sits right at the screen edge, so its outer lamp is partly cut off. At 1440×900 the left lamp is centred at x ≈ −1.2 with a radius of 9.4. For the same reason, about a third of the fans drawn on the side walls are off-screen. This breaks no requirement, and the theme is still clear.