A killed session was full-deleted from state.json (removeSession),
dropping the COD-139 pinned/pinnedAt fields, so the session vanished
from the session-manager pinned group. cleanupStaleSessions also reaped
any persisted record with no live session on boot, which would have
wiped a preserved pin on the next restart.
Fix (state-store):
- demoteOrRemoveSession(id): on kill, demote a *pinned* record to a
lightweight stopped record (status=stopped, pid=null, pin retained)
instead of deleting; unpinned records are removed as before.
- cleanupStaleSessions skips pinned records so the pin survives restart.
- server _doCleanupSession calls demoteOrRemoveSession on the killMux
path (shutdown path unchanged).
Restoration iterates live mux sessions, not state.json, so a stopped+
pinned record is never auto-revived. Unit-tested on the real StateStore
path (state-store.test.ts +4); session-cleanup/session-pin regress green.
(cherry picked from commit 86f183eacfc3f2f6ac28499fb1ae2d21eef2bbed)
Aamer Akhter
35a0217ccd