feat: implement golemancy combat system (spec §6, §9)

- Add ActiveGolem interface and activeGolems to GolemancyState
- Add maxRoomDuration to all 12 golem definitions
- Create golem-combat-actions.ts with pure golem combat logic (summoning, maintenance, attacks, room-duration)
- Create golem-combat.ts pipeline for golem combat setup
- Wire golem maintenance and attacks into processCombatTick
- Wire golem summoning into advanceRoomOrFloor on room entry
- Wire golem room-duration countdown into onFloorCleared callback
- Update combat-actions tests for new processCombatTick signature
- All 921 tests pass, all files under 400-line limit

Closes #259

src/lib/game/stores/gameStore.ts

@@ -23,6 +23,8 @@ import { createSafeStorage } from '../utils/safe-persist';
 import { createStartNewLoop } from './gameLoopActions';
 import { buildTickContext, applyTickWrites } from './tick-pipeline';
 import { processEnchantingTicks } from './pipelines/enchanting-tick';
+import { buildGolemCombatPipeline } from './pipelines/golem-combat';
+
 import type { TickContext, TickWrites } from './tick-pipeline';
 import type { GameCoordinatorState } from './gameStore.types';
 import type { EnemyState } from '../types';
@@ -294,44 +296,25 @@ export const useGameStore = create<GameCoordinatorStore>()(
 
           // Combat — delegate to combatStore
           if (ctx.combat.currentAction === 'climb') {
-            const combatCbs = buildCombatCallbacks({
-              ctx, effects, maxMana, addLog, useCombatStore, usePrestigeStore,
-            });
-
-            // Mage barrier recharge (spec §5.2) — recharge before building defense ctx
+            const combatCbs = buildCombatCallbacks({ ctx, effects, maxMana, addLog, useCombatStore, usePrestigeStore });
             const roomEnemies = ctx.combat.currentRoom?.enemies ?? [];
             const primaryEnemy = roomEnemies[0] ?? null;
-            const rechargedEnemy = combatCbs.applyMageBarrierRecharge(primaryEnemy);
-            const activeEnemy = rechargedEnemy ?? primaryEnemy;
-
-            // Build enemy defense context for this tick (spec §5.2)
-            const defCtx = {
-              roomType: ctx.combat.currentRoom?.roomType ?? 'combat',
-              enemy: activeEnemy,
-            };
-
+            const activeEnemy = combatCbs.applyMageBarrierRecharge(primaryEnemy) ?? primaryEnemy;
+            const defCtx = { roomType: ctx.combat.currentRoom?.roomType ?? 'combat', enemy: activeEnemy };
+            const golemPipeline = buildGolemCombatPipeline(addLog);
             const combatResult = useCombatStore.getState().processCombatTick(
               rawMana, elements, maxMana, 1,
               combatCbs.onFloorCleared,
               combatCbs.makeOnDamageDealt(() => rawMana, () => elements, defCtx, addLog),
               ctx.prestige.signedPacts,
+              { activeGolems: golemPipeline.activeGolems },
+              golemPipeline.golemApplyDamageToRoom,
             );
-
             rawMana = combatResult.rawMana;
             elements = combatResult.elements;
             totalManaGathered += combatResult.totalManaGathered || 0;
-            if (combatResult.logMessages) {
-              combatResult.logMessages.forEach(msg => addLog(msg));
-            }
-            writes.combat = {
-              ...(writes.combat || {}),
-              currentFloor: combatResult.currentFloor,
-              floorHP: combatResult.floorHP,
-              floorMaxHP: combatResult.floorMaxHP,
-              maxFloorReached: combatResult.maxFloorReached,
-              castProgress: combatResult.castProgress,
-              equipmentSpellStates: combatResult.equipmentSpellStates,
-            };
+            if (combatResult.logMessages) combatResult.logMessages.forEach(msg => addLog(msg));
+            writes.combat = { ...(writes.combat || {}), currentFloor: combatResult.currentFloor, floorHP: combatResult.floorHP, floorMaxHP: combatResult.floorMaxHP, maxFloorReached: combatResult.maxFloorReached, castProgress: combatResult.castProgress, equipmentSpellStates: combatResult.equipmentSpellStates, golemancy: { ...(writes.combat?.golemancy || ctx.combat.golemancy), activeGolems: combatResult.activeGolems } };
           }
 
           if (ctx.combat.currentAction === 'craft') {