Main b5a226e49c; Linux x64; Node 24.21.0; Claude 2.1.303; real Vite web 1280x800.
Two Claude instances with independent config/history directories, same available proxy login.
00:00:19 sent A native Agent run_in_background sleep 180 then marker.
00:00:26 parent idle; background launched.
00:00:31 selected B in composer and sent Reply only B selected.
00:00:36 B responded; A and B session projections both ready (before-sessions.json).
00:01:19 A PID 1262979 and B PID 1264173 alive with cwd in isolated worktree apps/server.
No provider-session.detach effect queued for this thread.

Persisted event summary (orchestration_events):
2026-10-22T00:00:19.236Z provider-session.attached {"providerInstanceId": "a", "status": "ready"}
2026-10-22T00:00:31.897Z thread.provider-switched {"providerInstanceId": "b"}
2026-10-22T00:00:31.947Z provider-session.attached {"providerInstanceId": "b", "status": "ready"}
2026-10-22T00:02:10.767Z run.background-work-cancelled {}


Limitation: editing the regression test triggered Node dev-server watch restart before the 180-second marker; the delayed wake/marker was therefore not observed. The missing detach and retained live A process were observed before that restart.