v3.23.0 — nightly vector-DB backup

Nightly vector-memory DB backup

• WAL-safe snapshots of .swarm/memory.db via better-sqlite3's online .backup() — a naive copy of a WAL-mode DB can corrupt; this is consistent + non-destructive (read-only source).
• Rotation (keep last N, default 7) + optional GCS offsite (--gcs gs://… / RUFLO_BACKUP_GCS).
• memory backup CLI (--db/--dir/--keep/--gcs) + a daemon backup worker (24h, enabled by default, opt-out via -w).

All backward-compatible. 3-package train at 3.23.0.

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