fix(ci): restore release gates and contract baseline (fixes #4)

backend/tests/test_sprint159_split_promotion_workflow.py

@@ -15,22 +15,15 @@ def _bash_path(path: Path) -> str:
     if os.name != "nt":
         return raw_path
 
-    try:
-        result = subprocess.run(
-            ["bash", "-lc", f"wslpath -a {shlex.quote(raw_path)}"],
-            capture_output=True,
-            text=True,
-            timeout=10,
-            check=False,
-        )
-    except (subprocess.TimeoutExpired, OSError):
-        # Starting WSL can exceed ten seconds while the rest of the suite is
-        # running. The fallback below is what this helper already does whenever
-        # the conversion does not work, so a slow shell must not red the suite.
-        return raw_path
-    if result.returncode == 0 and result.stdout.strip():
-        return result.stdout.strip()
-    return raw_path
+    # ``bash`` is WSL on the supported Windows development path. Converting
+    # the drive path directly avoids starting a second WSL process merely to
+    # run ``wslpath``; that process can time out while the full suite is busy
+    # and would leave curl with an invalid file://C:\\... URL.
+    drive, tail = os.path.splitdrive(raw_path)
+    if drive:
+        normalized_tail = tail.lstrip("\\/").replace("\\", "/")
+        return f"/mnt/{drive[0].lower()}/{normalized_tail}"
+    return raw_path.replace("\\", "/")
 
 
 def test_split_background_promotion_workflow_runs_split_then_split_aware_report() -> None: