Why: the 2026-10-11 runtime/ deletion lost all agent SQLite data with no
backup; the svc-autorecover closing report left "agent SQLite backup" as
a follow-up and the user asked to land it (recovery plan U2 residue).
Evidence: tests/test_svc_backup.py 11/11 green locally (live WAL writer,
manifest sha, retention, guards); make test-governance full suite green
(159 tests, rerun twice after one unreproduced flake).
Impact: new service-level actions backup/backups; snapshots live in
runtime-backups/<name>/ outside runtime/; rm --purge removes them; pg
backup and other flows unchanged.
Refs: modules/documents/docs/proposals/2026-10-12-service-restart-data-recovery.md r2 (sec 6, U2 residue); task card .task/feature-svc-agent-backup.md.
weichen
3ca4f3bc35