refactor(llm): remove isDailyLimitReached from downstream consumers

The LlmService interface no longer exposes isDailyLimitReached — model
switching is handled internally. Remove all checks in thoughtSystem,
inventionSystem, narrationService, and thoughtGenerator. Update mocks
in test files to match the new interface and remove obsolete daily-limit
test cases.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/systems/thoughtSystem.ts

@@ -36,7 +36,6 @@ export function createThoughtSystem(
       lastPeriodicTick = tick;
 
       if (pendingGeneration) return;
-      if (llmService.isDailyLimitReached()) return;
 
       const eligible: { entityId: EntityId; context: ThoughtContext }[] = [];
       const npcs = world.query('npcBrain', 'name', 'stats', 'needs');