Chemistry row *Spread* (canon CONCEPT.md § tag grammar): a heated
enemy slammed into another (knockback impact >= threshold, not a
walking bump) spreads its heat on contact and passes momentum, so
chains cascade with decaying force — chemistry feeding chemistry.
Authorship-loud feedback stack per canon: ~80ms hitstop (owned by the
hand, capped so chain procs can't lock the world; rides on top of
freeze/thaw states), the two tag hues meeting at the point of impact
(oriented fx, no proc text), and a per-pair audio sting (procedural
placeholder, _ph-marked per asset policy).
Burster: second enemy type, HEAT-tagged walking bomb (orange base,
literal tag mirror) — self-heats ~0.5/s toward threshold, big
detonation. Every 4th spawn. Detonations are now symmetric: they
damage enemies AND the mech in radius (one grammar on both sides;
heat play prices standing close). Grunt scene exports drive both
enemy types — no subclass.
Smoke gate extended: burster self-heat observed (retry-tolerant),
deterministic staged chemistry proc (heated striker slammed into cold
neighbor outside weapon range -> proc counter, heat spread). 3/3
green on nh3-dev headless 4.7.1. Known cosmetic: 2 ObjectDB instances
reported leaked at exit (constant, exit-order artifact — audio stream
alive at quit), not a runtime leak.
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