fix: spire combat 11 high-severity discrepancies (issue #333)

D-01: Implement per-weapon cast progress (weaponCastProgress record)
D-04: Bypass Executioner/Berserker discipline specials for golem attacks
D-09: Fix lightning counter direction (lightning→water, not lightning→earth)
D-10: Add full composite element counters (blackflame/radiantflames ↔ frost/water/light/dark)
D-15: Fix Executioner to check per-enemy HP < 25% instead of floorHP ratio
D-20: Fix dodge formula to match spec (min(0.55, floor × 0.003), starts at 0)
D-22: Fix shield modifier to use flat HP pool instead of percentage barrier
D-23: Wire up applyMageBarrierRecharge in the damage pipeline
D-25: Move guardian regen from per-damage-event to once-per-tick
D-26: Add guardian armor reduction to the guardian defensive pipeline
D-31: Fix armor_corrode to be temporary (restore armor on effect expiry)
D-38: Implement AoE damage distribution across enemies

All 1069 tests pass. No files exceed 400 lines.

src/lib/game/stores/gameStore.ts

@@ -247,6 +247,8 @@ export const useGameStore = create<GameCoordinatorStore>()(
           // Combat
           if (ctx.combat.currentAction === 'climb') {
             const combatCbs = buildCombatCallbacks({ ctx, effects, maxMana, addLog, useCombatStore, usePrestigeStore });
+            // Guardian regen once per tick (not per-damage-event, spec §5.3, D-25 fix)
+            combatCbs.applyGuardianRegen();
             const roomEnemies = ctx.combat.currentRoom?.enemies ?? [];
             const primaryEnemy = roomEnemies[0] ?? null;
             const activeEnemy = combatCbs.applyMageBarrierRecharge(primaryEnemy) ?? primaryEnemy;
@@ -272,7 +274,7 @@ export const useGameStore = create<GameCoordinatorStore>()(
             rawMana = cr.rawMana; elements = cr.elements;
             totalManaGathered += cr.totalManaGathered || 0;
             if (cr.logMessages) cr.logMessages.forEach(msg => addLog(msg));
-            writes.combat = { ...(writes.combat || {}), currentFloor: cr.currentFloor, floorHP: cr.floorHP, floorMaxHP: cr.floorMaxHP, maxFloorReached: cr.maxFloorReached, castProgress: cr.castProgress, equipmentSpellStates: cr.equipmentSpellStates, golemancy: { ...(writes.combat?.golemancy || ctx.combat.golemancy), activeGolems: cr.activeGolems }, meleeSwordProgress: cr.meleeSwordProgress, currentRoom: cr.currentRoom };
+            writes.combat = { ...(writes.combat || {}), currentFloor: cr.currentFloor, floorHP: cr.floorHP, floorMaxHP: cr.floorMaxHP, maxFloorReached: cr.maxFloorReached, castProgress: cr.castProgress, weaponCastProgress: cr.weaponCastProgress, equipmentSpellStates: cr.equipmentSpellStates, golemancy: { ...(writes.combat?.golemancy || ctx.combat.golemancy), activeGolems: cr.activeGolems }, meleeSwordProgress: cr.meleeSwordProgress, currentRoom: cr.currentRoom } as Partial<CombatState>;
           }
 
           // Non-combat room tick (library, recovery, treasure, puzzle)