feat: implement regular enemy defenses — armor, barrier, dodge (spec §5.2)

- Add applyEnemyDefenses() pipeline: dodge → barrier → armor for ALL enemies
- Add speed room + agile additive dodge (capped at 0.75, spec §4.5)
- Add mage barrier recharge per tick (spec §5.2)
- Add effectiveArmor support for armor_corrode debuff compatibility
- Pass enemy defense context via closure (no signature changes to onDamageDealt)
- Add 16 regression tests for defense mechanics
- All 921 tests pass (45 test files)

src/lib/game/stores/gameStore.ts

@@ -25,6 +25,7 @@ import { buildTickContext, applyTickWrites } from './tick-pipeline';
 import { processEnchantingTicks } from './pipelines/enchanting-tick';
 import type { TickContext, TickWrites } from './tick-pipeline';
 import type { GameCoordinatorState } from './gameStore.types';
+import type { EnemyState } from '../types';
 
 export interface GameCoordinatorStore extends GameCoordinatorState {
   tick: () => void;
@@ -296,10 +297,23 @@ export const useGameStore = create<GameCoordinatorStore>()(
             const combatCbs = buildCombatCallbacks({
               ctx, effects, maxMana, addLog, useCombatStore, usePrestigeStore,
             });
+
+            // Mage barrier recharge (spec §5.2) — recharge before building defense ctx
+            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 combatResult = useCombatStore.getState().processCombatTick(
               rawMana, elements, maxMana, 1,
               combatCbs.onFloorCleared,
-              combatCbs.makeOnDamageDealt(() => rawMana, () => elements),
+              combatCbs.makeOnDamageDealt(() => rawMana, () => elements, defCtx, addLog),
               ctx.prestige.signedPacts,
             );