feat: implement Room Enchantments system for Enchanter attunement

- Add roomEnchantment field to FloorState (coverage meter 0-100)
- Add 8 room enchantment effect definitions (fire/frost/death/lightning/dark/earth/transference)
- Add room-enchanting discipline with perks (room-coverage-rate capped, resonant-stamps once, 8 unlock perks)
- Add room enchantment combat tick phase (after DoT) with coverage growth and effect application
- Add coverage carryover between rooms via resonant-stamps perk
- Add RoomDisplay coverage bar and effect magnitude UI
- Add room-enchantments-utils.ts for coverage/effect computation
- Extract combat-room-enchantments.ts to keep combat-actions.ts under 400 lines
- Add 25 tests covering all acceptance criteria (AC-1 through AC-22)

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-06-13T17:47:22.745Z",
+    "generated": "2026-06-14T19:56:35.928Z",
     "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."
   },
@@ -554,6 +554,7 @@
       "constants.ts",
       "data/guardian-encounters.ts",
       "effects/discipline-effects.ts",
+      "stores/combat-channel.ts",
       "stores/combat-damage.ts",
       "stores/combat-invocation.ts",
       "stores/combat-melee.ts",
@@ -564,6 +565,14 @@
       "types.ts",
       "utils/index.ts"
     ],
+    "stores/combat-channel-actions.ts": [
+      "stores/combat-state.types.ts"
+    ],
+    "stores/combat-channel.ts": [
+      "effects/discipline-effects.ts",
+      "stores/combat-state.types.ts",
+      "stores/manaStore.ts"
+    ],
     "stores/combat-damage.ts": [
       "constants/spells.ts",
       "data/enchantment-effects.ts",
@@ -596,6 +605,7 @@
     "stores/combat-melee.ts": [
       "constants.ts",
       "data/guardian-encounters.ts",
+      "stores/combat-channel.ts",
       "stores/combat-damage.ts",
       "stores/combat-state.types.ts",
       "types.ts",
@@ -615,6 +625,7 @@
     "stores/combatStore.ts": [
       "data/guardian-encounters.ts",
       "stores/combat-actions.ts",
+      "stores/combat-channel-actions.ts",
       "stores/combat-descent-actions.ts",
       "stores/combat-reset.ts",
       "stores/combat-state.types.ts",