refactor: Redesign Invoker disciplines for pact bonuses and guardian boons

- Replace generic spell-casting/void-manipulation with pact-focused disciplines
- Add Pact Attunement (light): reduces pact signing time, boosts pact affinity
- Add Guardian's Boon (dark): amplifies all guardian unique perks
- Add pactAffinityBonus and guardianBoonMultiplier stat keys to effect system
- Apply pactAffinityBonus in pact signing time calculation (gameStore)
- Scale guardian boon values by guardianBoonMultiplier (combat-utils)
- Guard Invoker discipline activation behind signedPacts.length > 0
- Add 'Signed guardian pact' prerequisite display in discipline-math

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

@@ -46,7 +46,7 @@ export interface DisciplineStoreState {
 }
 
 export interface DisciplineStoreActions {
-  activate: (id: string, gameState?: { elements?: Record<string, ElementState> }) => void;
+  activate: (id: string, gameState?: { elements?: Record<string, ElementState>; signedPacts?: number[] }) => void;
   deactivate: (id: string) => void;
   processTick: (mana: { rawMana: number; elements: Record<string, ElementState> }) => {
     rawMana: number;
@@ -90,6 +90,12 @@ export const useDisciplineStore = create<DisciplineStore>()(
           if (nonPaused >= s.concurrentLimit) return s;
           if (!canProceedDiscipline(def, existing, gameState)) return s;
 
+          // Invoker disciplines require at least one signed guardian pact
+          if (def.attunement === 'invoker') {
+            const signedPacts = gameState?.signedPacts || [];
+            if (signedPacts.length === 0) return s;
+          }
+
           // Check discipline prerequisites (requires field → discipline XP)
           const prereqCheck = checkDisciplinePrerequisites(def, s.disciplines, ALL_DISCIPLINES);
           if (!prereqCheck.canProceed) return s;