The deeper payoff of the flora loop. A new `biofilm` level event: cross one and combat checks
BIOME STANDING — high enough (>= need), the native flora PART the biofilm, budding a wave of phage
allies + refilling coat, then spending the goodwill; too low, it stays sealed and you run the
gauntlet raw. Emits `biofilm {opened}` so E can voice both.
- combat/index.js: biofilmGate(ev) on the level:event pump (fields need/allies/coat).
- levels/index.js: the selfcheck knows the `biofilm` type now (validates need 0..100).
- L2: one demoed at s2500 — the opening flora/akkermansia/beacon let you BANK standing, and the
gate cashes it into a phage escort right before the hiatus + reflux finale.
The mechanism is complete; L5 also gets the fast-route/Appendix branch when that level + world
support land. Verified in-engine: high standing -> opened, 3 phages, coat 50->90; low -> sealed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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