fix: discipline reset on mana depletion and re-activation after stop

- #143: processTick now removes drained disciplines from activeIds and calls onStopPracticing so currentAction resets to 'meditate'
- #144: Removed paused guard from canProceedDiscipline so stopped disciplines can be re-activated
- Updated test to match new expected behavior for paused disciplines

src/lib/game/utils/discipline-math.ts

@@ -68,7 +68,6 @@ export function canProceedDiscipline(
   gameState?: { elements?: Record<string, any>; rawMana?: number }
 ): boolean {
   if (!disciplineState) return true;
-  if (disciplineState.paused) return false;
 
   // If no game state provided, allow activation (optimistic)
   if (!gameState) return true;