orion-ecs / keen-eye / 30127990464

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feat(samples): Add NOVAFALL Phase A - playable core of the Fall Down reimagining

New flagship 2D arcade sample: a gravity-bound ball steered LEFT/RIGHT only,
dropping through gaps in floors that scroll upward toward a lethal Furnace
ceiling. Clean gap-throughs stoke a Heat resource through four tiers
(Ember/Flame/Plasma/Nova) gating the score multiplier (x1/x2/x4/x8); landing
halves heat, resting bleeds it, only death resets it. Score is meters fallen
times the live multiplier, integrated per frame.

- One system per concern with explicit Update-phase orders; render via
  I2DRenderer resolved lazily through TryGetExtension (UIRenderSystem pattern)
- Simulation runs in a fixed 720x1080 design space, fully decoupled from the
  window; TimeScale singleton hook for later hitstop
- Floor layout is a pure function of (seed, floorIndex) via a self-contained
  SplitMix64 generator (KEEN030-compliant), shared by gameplay and the
  headless '--simulate <frames>' determinism harness (byte-identical output
  across runs, verified for two seeds)
- Teaching comment in CollisionSystem on when a spatial index would (not)
  earn its keep

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