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First Archon encounter: a cyclical pattern-recognition puzzle. Boss AI: 4-phase cycle (Coil → Spray → Lash → Digest) with escalating difficulty (10% faster per cycle, caps at 5 cycles). Victory paths (all based on real chemistry): - Chemical: NaOH during Spray phase (acid-base neutralization, 3x dmg) - Direct: any projectile during Digest vulnerability window - Catalytic: Hg poison stacks (mercury poisons catalytic sites, reduces regen+armor permanently) New files: src/boss/ (types, ai, victory, arena, factory, reward), src/data/bosses.json, src/scenes/BossArenaScene.ts, tests/boss.test.ts Extended: ECS Boss component, CodexEntry 'boss' type, GameScene triggers arena on Resolution phase completion. 70 new tests (455 total), all passing. Co-authored-by: Cursor <cursoragent@cursor.com>