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Layer 3 of the approved Agent-Liveness RFC. Catches the busy-but-silently- hung case the Redis TTL liveness monitor (offline/dead only) and the operator status=failed watchdog both miss: a workspace that is status=online with active_tasks>0 but has produced NO activity for too long. This is what let JRS sit dead ~2.5h. - Migration 20260610140000_workspaces_last_activity: adds workspaces. last_activity_at TIMESTAMPTZ + a partial index over (online, busy), and a workspace_stall_state bookkeeping table. Idempotent, safe under the re-apply-all migration runner. - Stamp last_activity_at write-through on every activity_logs write, folded into the existing INSERT as a single CTE statement in logActivityExec: no extra round-trip on the latency path, atomic in the Tx case, and the Exec text still contains INSERT INTO activity_logs so existing sqlmock expectations keep matching. - stall_watchdog.go sweeper mirrors request_nudge_sweeper / delegation_ sweeper (ticker, envDuration, panic-recovering Start, injectable enqueue seam, raw SQL). Two-stage: detect (online + active_tasks>0 + stale) -> PROBE via EnqueueA2A -> if still silent past PROBE_GRACE -> soft-restart via injected WorkspaceHandler.RestartByID (existing-volume, same path POST /workspaces/:id/restart uses). Activity-resumed clears the state; COOLDOWN anti-flap; bounded LIMIT; structured logs + audit rows. - Wired into cmd/server/main.go beside the other sweepers, gated by STALL_WATCHDOG_DISABLED. - stall_watchdog_test.go (sqlmock): probe / restart / clear / cooldown / empty-noop / nil-restart probe-only / env-override. Thresholds (env knobs): STALL_WATCHDOG_INTERVAL_S=180, _STALE_AFTER_S=720, _PROBE_GRACE_S=300, _COOLDOWN_S=1800; disable STALL_WATCHDOG_DISABLED. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>