fix: resolve v2 harness import collision with explicit path loading (closes #716)

uni-wizard/v2/router.py

@@ -17,8 +17,24 @@ from typing import Dict, Any, Optional, List
 from pathlib import Path
 from dataclasses import dataclass
 from enum import Enum
+import importlib.util
 
-from harness import UniWizardHarness, House, ExecutionResult
+
+def _load_local(module_name: str, filename: str):
+    """Import a module from an explicit file path, bypassing sys.path resolution."""
+    spec = importlib.util.spec_from_file_location(
+        module_name,
+        str(Path(__file__).parent / filename),
+    )
+    mod = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(mod)
+    return mod
+
+
+_harness = _load_local("v2_harness", "harness.py")
+UniWizardHarness = _harness.UniWizardHarness
+House = _harness.House
+ExecutionResult = _harness.ExecutionResult
 
 
 class TaskType(Enum):

uni-wizard/v2/task_router_daemon.py

@@ -8,13 +8,30 @@ import time
 import sys
 import argparse
 import os
+import importlib.util
 from pathlib import Path
 from datetime import datetime
 from typing import Dict, List, Optional
 
-sys.path.insert(0, str(Path(__file__).parent))
+def _load_local(module_name: str, filename: str):
+    """Import a module from an explicit file path, bypassing sys.path resolution.
+
+    Prevents namespace collisions when multiple directories contain modules
+    with the same name (e.g. uni-wizard/harness.py vs uni-wizard/v2/harness.py).
+    """
+    spec = importlib.util.spec_from_file_location(
+        module_name,
+        str(Path(__file__).parent / filename),
+    )
+    mod = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(mod)
+    return mod
+
+_harness = _load_local("v2_harness", "harness.py")
+UniWizardHarness = _harness.UniWizardHarness
+House = _harness.House
+ExecutionResult = _harness.ExecutionResult
 
-from harness import UniWizardHarness, House, ExecutionResult
 from router import HouseRouter, TaskType
 from author_whitelist import AuthorWhitelist