This commit addresses all critical follow-up issues identified in the
code review of PR #8 (atomic counter implementation).
## bd-64: Fix SyncAllCounters performance bottleneck (P0)
- Replace SyncAllCounters() on every CreateIssue with lazy initialization
- Add ensureCounterInitialized() that only scans prefix-specific issues on first use
- Performance improvement: O(n) full table scan → O(1) for subsequent creates
- Add comprehensive tests in lazy_init_test.go
## bd-65: Add migration for issue_counters table (P1)
- Add migrateIssueCountersTable() similar to migrateDirtyIssuesTable()
- Checks if table is empty and syncs from existing issues on first open
- Handles both fresh databases and migrations from old databases
- Add comprehensive tests in migration_test.go (3 scenarios)
## bd-66: Make import counter sync failure fatal (P1)
- Change SyncAllCounters() failure from warning to fatal error in import
- Prevents ID collisions when counter sync fails
- Data integrity > convenience
## bd-67: Update test comments (P2)
- Update TestMultiProcessIDGeneration comments to reflect fix is in place
- Change "With the bug, we expect errors" → "After the fix, all should succeed"
All tests pass. Atomic counter implementation is now production-ready.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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