v0.5.0

New

• Auto-memory health scores — per-file grading (freshness, structure, specificity, connectedness) with letter grades and improvement suggestions

Changed

• Removed cross-project edges from memory graph — the entity-based linking (SSH hosts, binary paths) was noise, not signal

Fixed

• Flaky TestHandleHistory — use relative date instead of hardcoded value that drifts out of the query window