ox-session-review

Audit every session in the project ledger for quality, then offer cleanup and regeneration. Carries the operational knowledge from the 2026-04-25 cleanup (the cache-only invariant and a failure-mode watch-list) that no single ox subcommand backs. Use when the user asks to "review the ledger sessions", "audit session quality", "clean up bad session summaries", "regenerate session summaries", invokes the…