fix(issue-50): the monitor labels a row with the server that answered

A `default` scan runs without -L, so the shim answers it from the inherited
HERDR_SESSION_NAME; a create's reconcile --once labelled that server's panes
`default`, and since create adopts only a row of its own server (1e25cf2f
F2), parallel creates in one folder were refused (test_tier4_e2e scenario 4).
The skill-blocks data follows create_session.sh's SystemExit line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VCgu9Fa9iT7TbJUSzdq4Ff

.agents/skills/multi-agent-mux-monitor/scripts/reconcile.sh

@@ -656,6 +656,14 @@ if herdr_confirmed:
             continue
         _adapter = get_adapter(agent)
         cmd_full = _adapter.spawn_spec(agent) if _adapter else agent
+        # The row names the server that answered. A `default` scan runs without
+        # -L, so the shim answers it from the inherited HERDR_SESSION_NAME (a
+        # create's reconcile --once inherits the create's server): that server,
+        # not `default`, is this pane's - create matches its own pane's row by
+        # it (Issue #50, review 1e25cf2f F2).
+        _ambient = os.environ.get('HERDR_SESSION_NAME', '')
+        if srv == 'default' and _ambient and _ambient != 'default':
+            srv = _ambient
         server_opt = f"-L {srv} " if srv != 'default' else ""
         # The shim resolves this from the pane's root process. Fall back to now
         # only if that failed: 'now' can merely over-estimate creation time,