- bd-159: Track last_import_time in metadata after auto-import
- bd-160: Add staleness check to daemon before serving requests
- Detects when JSONL mtime > last import time
- Currently logs warning (needs bd-166 for actual import trigger)
- Add lastImportTime field to RPC Server struct with getter/setter
- Add checkAndAutoImportIfStale() method to detect stale JSONL
This is part of bd-158 epic to fix daemon showing stale data after git pull.
Amp-Thread-ID: https://ampcode.com/threads/T-b554e049-aff8-4a24-8bf3-3305483b7f5a
Co-authored-by: Amp <amp@ampcode.com>
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