Three critical fixes to make event-driven mode production-ready:
1. Skip redundant imports: Check JSONL mtime vs DB mtime to avoid
self-triggered import loops after export writes JSONL
2. Add server.Stop() in serverErrChan case: Ensures clean RPC
server shutdown on errors
3. Fallback ticker (60s): When file watcher unavailable (e.g., network
filesystems), fall back to periodic polling to detect remote changes
These minimal fixes address Oracle's concerns without over-engineering.
Event-driven mode is now safe for default.
Amp-Thread-ID: https://ampcode.com/threads/T-a9a67394-37ca-4b79-aa23-c5c011f9c0cd
Co-authored-by: Amp <amp@ampcode.com>
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