fix(lib): prevent set -u unbound variable error for final_cmd in kind detection and harden test fixtures

tests/conftest.py

@@ -87,12 +87,12 @@ if not os.path.exists(state_file):
     sys.exit(0)
 
 # Lock the state file exclusively to prevent concurrent race conditions
-lock_f = open(state_file + ".lock", "w")
+lock_f = open(state_file + ".lock", "a")
 fcntl.flock(lock_f, fcntl.LOCK_EX)
 
 state = {"workspaces": [], "agents": {}, "calls": []}
 if os.path.exists(state_file):
-    for _retry in range(10):
+    for _retry in range(50):
         try:
             with open(state_file, 'r') as f:
                 content = f.read().strip()
@@ -100,16 +100,35 @@ if os.path.exists(state_file):
                     state = json.loads(content)
                     break
         except Exception:
-            import time
-            time.sleep(0.05)
+            pass
+        time.sleep(0.02)
 
 # Record the command call
 state["calls"].append(sys.argv[1:])
 
 def save_state():
+    disk_state = {"workspaces": [], "agents": {}, "calls": []}
+    if os.path.exists(state_file):
+        for _retry in range(50):
+            try:
+                with open(state_file, 'r') as f:
+                    content = f.read().strip()
+                    if content:
+                        disk_state = json.loads(content)
+                        break
+            except Exception:
+                pass
+            time.sleep(0.02)
+    disk_state["agents"] = state.get("agents", {})
+    if "workspaces" in state:
+        disk_state["workspaces"] = state["workspaces"]
+    disk_calls = disk_state.setdefault("calls", [])
+    if sys.argv[1:] and (not disk_calls or disk_calls[-1] != sys.argv[1:]):
+        disk_calls.append(sys.argv[1:])
+
     tmp_state = state_file + f".tmp.{os.getpid()}"
     with open(tmp_state, 'w') as f:
-        json.dump(state, f, indent=2)
+        json.dump(disk_state, f, indent=2)
         f.flush()
         os.fsync(f.fileno())
     os.replace(tmp_state, state_file)
@@ -242,7 +261,7 @@ elif cmd1 == "agent":
             "cwd": cwd or "TMP_PATH_PLACEHOLDER",
             "workspace_id": ws or "w1",
             "pid": 9999,
-            "pane_id": f"w1:p{len(agents)+1}",
+            "pane_id": f"w1:p_{name}",
             "command": " ".join(agent_cmd),
             "buffer": buffer_content
         }
@@ -376,7 +395,7 @@ elif cmd1 == "agent":
         agents = state.get("agents", {})
         if name in agents:
             agents[name]["sent_text"] = agents[name].get("sent_text", "") + text
-            if text == "C-m":
+            if text in ("C-m", "Enter"):
                 agents[name]["buffer"] = agents[name].get("buffer", "") + "\\nesc to interrupt"
             else:
                 agents[name]["buffer"] = agents[name].get("buffer", "") + "\\n" + text