MemoryStorage.GetStatistics() was returning 0 for blocked_issues and
ready_issues in no-db mode. The SQLite implementation correctly
calculated these based on dependencies, but the memory store only
counted explicit status values.
Changes:
- Reuse getOpenBlockers() helper for dependency-based blocked count
- Calculate ready_issues as open issues with no open blockers
- Add tombstone handling (exclude from TotalIssues)
- Add AverageLeadTime calculation for parity with SQLite
- Add EpicsEligibleForClosure calculation
- Add tests for blocked/ready counts, epics, and tombstones
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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