Root cause: Import and export commands tried to open the database directly
while the daemon already held the lock, causing indefinite blocking.
Solution: Both commands now explicitly close the daemon connection before
opening direct database access, avoiding SQLite lock contention.
Changes:
- import.go: Close daemon connection and open direct SQLite connection
- export.go: Close daemon connection before direct access
- Added debug logging to help diagnose similar issues
Tests: Existing TestImport and TestExport tests pass
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