docs(@projects/@magic-civilization): 🦠 p3-27 — fauna disease applier done (plague/pandemic mortality live)

EcologyEngine::apply_disease_events strikes fauna populations in the ecology phase from the
boot-loaded event configs. Remaining bio-events: marine (fish/reef), lair_kill_chance, o2 pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.project/objectives/p3-27-biosphere-headless.md

@@ -25,8 +25,7 @@ interact with.
 - [~] **Flora succession** — `EcologyEngine::process_step` already returns + applies `FloraTransition`s (subsumed in the ecology tick above). Confirm whether a separate `mc-flora::FloraEngine` pass is still needed or if process_step covers it.
 - [ ] **Marine ecology** — port `marine_harvest.gd` (372 lines: fish-stock depletion/
   recovery, coral-reef bleaching, `ocean_dead_fraction` → climate) into Rust + tick it.
-- [ ] **Bio-targeting events enabled** — once populations live headless, implement the
-  ecological/marine event categories (plague, pandemic, marine) that damage them (p3-26 B8).
+- [~] **Bio-targeting events** — fauna disease applier DONE (5890b1c15): EcologyEngine::apply_disease_events drives plague/pandemic/ecological mortality + canopy/tier loss from the boot-loaded events_config, struck in the ecology phase. Remaining: marine (fish/reef) + lair_kill_chance + o2_delta atmospheric pass.
 - [~] Deterministic from seed ✅ (cargo green, determinism test); headless e2e boot pending dylib rebuild + GUT boot proof.
 
 ## Notes