- Add JSONL timestamp check in validatePreExport
- Refuse export if JSONL is newer than database
- Force daemon to import before exporting when JSONL updated
- Add test case for JSONL-newer-than-DB scenario
- Fixes bd-89e2
- Added validatePreExport to prevent data loss
- Added checkDuplicateIDs to detect corruption
- Added checkOrphanedDeps to find orphaned dependencies (both sides)
- Added validatePostImport to ensure imports don't lose data
- CRITICAL FIX: Removed post-pull export that clobbered fresh JSONL
- Conservative checks when JSONL is unreadable
- Efficient COUNT(*) SQL path instead of loading all issues
- Comprehensive test coverage including edge cases
