feat: implement DoT/debuff runtime system (spec §6, AC-12, AC-13)

- Add ActiveEffect, EffectType types to game.ts; activeEffects + effectiveArmor on EnemyState
- Add SpellOnHitEffect + onHitEffect field to SpellDefinition
- Wire onHitEffect to fire (burn), death (curse), lightning (armor_corrode), frost (freeze), soul (bypassArmor burn)
- Add applyOnHitEffect() — applies on-hit effect on successful spell hit (spec §6.2)
- Add processDoTPhase() — ticks all active effects after weapon/golem attacks (spec §6.3)
- Add bypassArmor/bypassBarrier support in applyEnemyDefenses() (AC-13)
- Export standalone applyEnemyDefenses from combat-tick.ts for DoT pipeline
- Split DoT runtime into separate dot-runtime.ts (135 lines) to keep combat-actions.ts under 400 lines
- Update all enemy generation sites with activeEffects/effectiveArmor defaults
- Fix test helpers for new required fields

All 921 tests pass (45 test files)

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-06-02T14:39:44.895Z",
+    "generated": "2026-06-03T13:40:50.953Z",
     "description": "Import dependency graph for src/lib/game. Keys are files, values are arrays of files they import.",
     "usage": "To find what a file affects, search for its path in the VALUES. To find what a file depends on, look at its KEY entry."
   },
@@ -533,22 +533,33 @@
       "data/guardian-encounters.ts",
       "effects/discipline-effects.ts",
       "stores/combat-state.types.ts",
+      "stores/golem-combat-actions.ts",
       "types.ts",
       "utils/index.ts"
     ],
+    "stores/combat-descent-actions.ts": [
+      "data/guardian-encounters.ts",
+      "stores/combat-state.types.ts",
+      "stores/discipline-slice.ts",
+      "stores/golem-combat-actions.ts",
+      "stores/manaStore.ts",
+      "stores/prestigeStore.ts",
+      "types.ts",
+      "utils/spire-utils.ts"
+    ],
     "stores/combat-state.types.ts": [
       "types.ts"
     ],
     "stores/combatStore.ts": [
       "data/guardian-encounters.ts",
       "stores/combat-actions.ts",
+      "stores/combat-descent-actions.ts",
       "stores/combat-state.types.ts",
       "types.ts",
       "utils/activity-log.ts",
       "utils/index.ts",
       "utils/room-utils.ts",
-      "utils/safe-persist.ts",
-      "utils/spire-utils.ts"
+      "utils/safe-persist.ts"
     ],
     "stores/crafting-equipment-tick.ts": [
       "constants.ts",
@@ -661,15 +672,23 @@
       "stores/manaStore.ts",
       "stores/pipelines/combat-tick.ts",
       "stores/pipelines/enchanting-tick.ts",
+      "stores/pipelines/golem-combat.ts",
       "stores/pipelines/pact-ritual.ts",
       "stores/prestigeStore.ts",
       "stores/tick-pipeline.ts",
       "stores/uiStore.ts",
+      "types.ts",
       "utils/element-cap-bonus.ts",
       "utils/index.ts",
       "utils/safe-persist.ts"
     ],
     "stores/gameStore.types.ts": [],
+    "stores/golem-combat-actions.ts": [
+      "constants.ts",
+      "data/golems/index.ts",
+      "types.ts",
+      "utils/index.ts"
+    ],
     "stores/index.ts": [
       "constants.ts",
       "stores/attunementStore.ts",
@@ -696,7 +715,9 @@
       "constants.ts",
       "data/guardian-encounters.ts",
       "effects/special-effects.ts",
-      "effects/upgrade-effects.types.ts"
+      "effects/upgrade-effects.types.ts",
+      "stores/golem-combat-actions.ts",
+      "types.ts"
     ],
     "stores/pipelines/enchanting-tick.ts": [
       "constants.ts",
@@ -715,6 +736,12 @@
       "stores/manaStore.ts",
       "stores/uiStore.ts"
     ],
+    "stores/pipelines/golem-combat.ts": [
+      "stores/combatStore.ts",
+      "stores/golem-combat-actions.ts",
+      "stores/manaStore.ts",
+      "types.ts"
+    ],
     "stores/pipelines/pact-ritual.ts": [
       "constants.ts",
       "data/guardian-encounters.ts",