- TruncateService as global Effect service on ManagedRuntime with
FileSystem for cleanup (readDirectory + remove)
- Hourly cleanup via Effect.forkScoped + Schedule.spaced
- Split into truncate-service.ts (Effect) + truncation.ts (facade)
to avoid circular import with runtime.ts
- Shared TRUNCATION_DIR constant in truncation-dir.ts
- Delete Scheduler module (no remaining consumers)
- Remove Truncate.init() from bootstrap (cleanup starts automatically
when runtime is created)
