fix(test): add list-panes support to mock_herdr and fix environment overrides in tier3 integration tests

tests/conftest.py

@@ -441,6 +441,21 @@ elif cmd1 == "pane":
         save_state()
         sys.exit(0)
 
+elif cmd1 == "list-panes":
+    session_target = ""
+    if "-t" in args:
+        session_target = args[args.index("-t") + 1]
+    agents = state.get("agents", {})
+    if session_target in agents:
+        data = agents[session_target]
+        pid = data.get("pid", 9999)
+        cwd = data.get("cwd", "TMP_PATH_PLACEHOLDER")
+        cmd = data.get("command", "claude")
+        print(f"{pid}|{cwd}|{cmd}")
+        sys.exit(0)
+    else:
+        sys.exit(1)
+
 elif cmd1 == "ls":
     if "-F" in args:
         for name, data in state.get("agents", {}).items():