Phase 3: 12 hook passives with conditional damage, auras, and kill/room effects

- dmgLiveMul live damage channel wired into fireWeapon, sawTick, fireBeam, orbitals
- Dead Weight (execute), Cauterized Veins (burn bonus), Pain Engine, Iron Lung,
  Slaughter Rhythm, Hollow Choir, Sawbone Coil, Glutton's Gut, Thresher Plate,
  Blood Moat, Meat Hook, Blood Debt
- Iron Lung re-armed per room in enterRoom; Slaughter Rhythm stamps kills
- Targeted smoke tests for the five stat-conditional effects; icons + docs

js/sprites.js

@@ -39,6 +39,9 @@ const SPRITE_MANIFEST = [
   'i_chillgland', 'i_hookedsinew', 'i_gyroscopicribs', 'i_marrowpiston', 'i_splitcortex',
   'i_gristlecord', 'i_renderedfat', 'i_whipcordtendon', 'i_rusteddiadem', 'i_gorgedtick',
   'i_bonemealpowder', 'i_rimedfang', 'i_butcherstwine', 'i_cindersump',
+  'i_deadweight', 'i_cauterizedveins', 'i_hollowchoir', 'i_sawbonecoil', 'i_gluttonsgut',
+  'i_slaughterrhythm', 'i_painengine', 'i_thresherplate', 'i_bloodmoat', 'i_ironlung',
+  'i_meathook', 'i_blooddebt',
   // full 64px/128px eight-direction action atlases
   'player_sheet', 'player_legs_sheet',
   'enemy_shambler_sheet', 'enemy_runner_sheet', 'enemy_spitter_sheet',