// world/_fixture.js (Lane A) — DEV FIXTURES, not shipping content.
// Lane C owns real levels (js/levels/*.json). FIXTURE survives C's levels landing because the
// spline selfcheck (a qa gate) asserts against its exact shape — headless, no three.js, no
// levels registry. Do not edit FIXTURE's segments without re-reading spline.js --selfcheck.

export const FIXTURE = {
  id: 'A_FIXTURE',
  name: 'Lane A fixture canal',
  seed: 20260716,
  segments: [
    { biome: 'esophagus', length: 300, radius: { base: 10, wobble: 0.25 }, curviness: 0.55, flow: 14 },
    { biome: 'esophagus', length: 240, radius: { base: 12, wobble: 0.35 }, curviness: 0.95, flow: 11 },
    { biome: 'stomach',   length: 120, radius: { base: 16, wobble: 0.30 }, curviness: 0.20, flow: 4 },
  ],
  arenas: [{ at: 620, radius: 55, biome: 'stomach' }],
  events: [],
};

// The tint contact sheet (?lvl=biomes in the harness): one straight-ish segment per registry
// biome, in registry order, generous radius so the wall — not the curve — is what you judge.
// Exists for the eyeball law: every biome tint gets re-checked against D's current pack in one
// fly-through whenever either side changes (tints, textures, colorspace, TBN…).
export const SIX_BIOMES = {
  id: 'A_SIX_BIOMES',
  name: 'Lane A biome contact sheet',
  seed: 20260716,
  segments: ['oral', 'esophagus', 'stomach', 'small_intestine', 'large_intestine', 'appendix']
    .map((biome) => ({ biome, length: 200, radius: { base: 10, wobble: 0.2 }, curviness: 0.25, flow: 8 })),
  arenas: [],
  events: [],
};