Data spine:
- Schema v1 ratified (TECH.md, C-owned). Additive over v0: schema/par/next, segment
name, cross-section placement (theta/rho as a FRACTION of safe radius), spread, span,
pickup+gate event types, hazard params. STUB_LEVEL synced (that const only, per
ROUND1 §Lane C.1) — world.hash() unchanged (1bdf001), geometry provably untouched.
- levels/index.js: registry + loader (node+browser, no THREE), real schema selfcheck
(qa's --selfcheck hook is now live) and a pacing simulator (--sim). Consumes the other
lanes' contracts live rather than restating them: A's biomes.js for ids and
wave.amp+breathe, A's SKIN, B's tuning.js hull radius, B's balance.js for scores.
- levels/enemies.js (fiction id -> archetype join table), levels/difficulty.js.
L2_esophagus — the vertical slice, complete: 3600 units, 7 beats, 47 events, 65 enemies,
10 checkpoints, 3 samples, reflux-surge finale. L1/L3 skeletons (shape only).
Anatomy is the level designer: the three real esophageal constrictions are the three
setpieces, and all three enemies are real esophageal pathology (bolus chunk, eosinophilic
esophagitis, candida esophagitis).
Measured (node web/js/levels/index.js --selfcheck|--sim; qa GREEN):
- selfcheck 3/3 valid, exit 0.
- pressure curve 0.27 -> 2.14 -> 4.35 -> 0.69 -> 4.53 -> 6.35 -> 4.40 (breather/pressure/
spike/breather/pressure/peak/finale).
- par 3:30 vs measured 2:47 speedrun / 3:19 par-pace / 4:22 timid; par.score 9000 of a
9400 kill budget (95%), computed from B's scores.
- all 10 checkpoint gaps within the <=30s death-cost law (max 28.8s); min clearance 2.73.
Two contract collisions found and resolved (LANE_C_NOTES):
- Biome ids: authored mouth/pharynx/cardia/pylorus; A's registry has six canonical ids and
rejected all four. A is right — biome = look, segments[].name = anatomy. Conformed.
- Balance: my first enemies.js restated hp/size/speed/score that B owns in balance.js.
Cut to a join table; index.js reads B's scores via scoreFor().
Caught live: A raised esophagus wave.amp 0.9 -> 1.4 mid-session, making the diaphragmatic
hiatus unflyable (2.33 vs the 2.5 floor). Widened 6.5 -> 6.8. The invariant also failed my
own aortic constriction's first draft (radius 7, symmetric squeeze) -> radius 9, directional.
No in-engine flythrough: ?stub=1&lvl= does not compose (snippet offered to F) and the stub
is single-segment, so it could only render beat 1. The pacing evidence is a kinematic model,
not a playtest — it proves L2 is flyable, paced and survivable, not that it feels good.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
