Save each comparison and let users reload past ones.
- migration 0008: topology_runs (workspace-scoped; full comparison as JSONB).
- cm-db repo::topology_runs (insert / list_recent / get) + regenerated .sqlx.
- cm-api: compare persists best-effort (never loses the LLM result on a DB
hiccup); GET /api/topology-runs (recent) + GET /api/topology-runs/{id}.
Integration test asserts persist → list → get.
- frontend: "Recent comparisons" list on the Compare tab; click to reload a
saved run. e2e p8 green (39 suite); offline build + clippy clean.
Server self-migrates at boot (cm_db::MIGRATOR), so 0008 applies on deploy.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
