Why: deploy overwrote live artifacts after stopping the old service, so
a failed start or workbench check left instances in a mixed
registration-vs-artifact state with no recovery path (2026-10-12
rdm1/rdmcand); the report's U2 requires restorable updates.
Evidence: make test-governance 250 OK; five svc suites 105 OK (rows in
the task card); new tests cover layout/pidcheck stability, rollback on
start failure with desired-state restore, build failure keeping the old
service running, interrupted-switch journal resolution, and schema-
advance blocking rollback without touching the database.
Impact: agent deploys stage immutable releases/<id>/ and switch the
current symlink atomically; deploy.journal persists the switch and is
resolved at start/restart/deploy/update/recover entries; legacy layouts
are adopted on first deploy and remain readable; release/rdm tracks
verify sha256 before staging.
Refs: .task/feature-svc-u2-release-recovery.md; user goal directive
2026-10-12; Dev #474 (U1 gate); Documents unified-deploy plan r2.
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