fix(process): list refreshes no longer leave exited children running

Carve the direct-child list reconciliation from Indigo Karasu's earliest
PR #60506 (2a96ae2cbf806ccdc3e9b584911774f32622f421), corroborated by
fangliquanflq's narrow #81385 (50ffd243d92627e4a03a3ee8427ad0f5e090c3ab).
Run the existing helper after task/session filtering and reuse the
idempotent owner-stamped completion path. Do not import cross-session
disclosure, bare-PID healing, forget RPCs, or reader rewrites.

A real-child regression fails before this change and passes after it:
the direct child exits while its descendant keeps writing to stdout;
listing reports exit without consuming the result or waiting for EOF.

Co-authored-by: fangliquanflq <fangliquan@qq.com>
Co-authored-by: Teknium <127238744+teknium1@users.noreply.github.com>

tools/process_registry.py

@@ -1950,6 +1950,9 @@ class ProcessRegistry(ProcessCheckpointMixin):
             ]
         result = []
         for s in all_sessions:
+            # List-only refreshes must observe child exit even while descendants
+            # keep the capture pipe open; retain the existing completion owner.
+            self._reconcile_local_exit(s)
             entry = {
                 "session_id": s.id,
                 "command": s.command[:200],