fix: resolve circular dependency in discipline-slice → discipline-effects

Replaced computeDisciplineEffects() import in discipline-slice.ts with
inline XP bonus calculation using calculateStatBonus from discipline-math.
This avoids the circular chain: discipline-effects → discipline-slice → discipline-effects.

src/lib/game/stores/discipline-slice.ts

@@ -6,11 +6,11 @@ import type { DisciplineState } from '../types/disciplines';
 import type { ElementState } from '../types';
 import {
   calculateManaDrain,
+  calculateStatBonus,
   canProceedDiscipline,
   checkDisciplinePrerequisites,
   getUnlockedPerks
 } from '../utils/discipline-math';
-import { computeDisciplineEffects } from '../effects/discipline-effects';
 import { baseDisciplines } from '../data/disciplines/base';
 import { elementalAttunementDisciplines } from '../data/disciplines/elemental';
 import { elementalRegenDisciplines } from '../data/disciplines/elemental-regen';
@@ -184,7 +184,28 @@ export const useDisciplineStore = create<DisciplineStore>()(
           }
 
           const oldXP = disc.xp;
-          const xpBonus = computeDisciplineEffects().bonuses.disciplineXpBonus || 0;
+          // Compute discipline XP bonus directly to avoid circular import
+          let xpBonus = 0;
+          for (const [did, dState] of Object.entries(newDisciplines)) {
+            if (!dState || dState.xp <= 0) continue;
+            const dDef = DISCIPLINE_MAP[did];
+            if (!dDef) continue;
+            // Only disciplines with disciplineXpBonus stat contribute
+            if (dDef.statBonus.stat === 'disciplineXpBonus') {
+              xpBonus += calculateStatBonus(
+                dDef.statBonus.baseValue,
+                dState.xp,
+                dDef.scalingFactor
+              );
+            }
+            // Perk bonuses for disciplineXpBonus
+            const perks = getUnlockedPerks(dDef, dState.xp);
+            for (const perk of perks) {
+              if (perk.bonus && perk.bonus.stat === 'disciplineXpBonus') {
+                xpBonus += perk.bonus.amount;
+              }
+            }
+          }
           const xpGain = 1 + xpBonus;
           newDisciplines[id] = { ...disc, xp: disc.xp + xpGain };
           newXP += xpGain;