Make harness verification portable

tests/test_core_flow.py

@@ -36,6 +36,9 @@ from aituner.worker import (
 from aituner.trace import TraceRequest
 
 
+REPO_ROOT = Path(__file__).resolve().parents[1]
+
+
 def _write_study_assets(
     tmp_path: Path,
     *,
@@ -842,7 +845,7 @@ class CoreFlowTests(unittest.TestCase):
                     "--overwrite",
                 ],
                 check=True,
-                cwd="/home/gahow/phd/aituner",
+                cwd=str(REPO_ROOT),
             )
 
             windows_payload = json.loads((output_root / "windows.json").read_text(encoding="utf-8"))
@@ -907,7 +910,7 @@ class CoreFlowTests(unittest.TestCase):
                     "chat",
                     "--overwrite",
                 ],
-                cwd="/home/gahow/phd/aituner",
+                cwd=str(REPO_ROOT),
                 capture_output=True,
                 text=True,
             )