fix(gateway): preserve WSL interop PATH in systemd units

hermes_cli/gateway.py

@@ -1608,6 +1608,46 @@ def _build_user_local_paths(home: Path, path_entries: list[str]) -> list[str]:
     return [p for p in candidates if p not in path_entries and Path(p).exists()]
 
 
+def _build_wsl_interop_paths(path_entries: list[str]) -> list[str]:
+    """Return WSL Windows interop PATH entries for generated systemd units.
+
+    WSL shells normally inherit Windows PATH entries such as
+    ``/mnt/c/WINDOWS/System32``. systemd user services do not, so gateway tools
+    that call ``powershell.exe``/``cmd.exe`` work in a terminal but fail in the
+    background service unless we persist the relevant entries at install time.
+    """
+    if not is_wsl():
+        return []
+
+    candidates: list[str] = []
+    for entry in os.environ.get("PATH", "").split(os.pathsep):
+        if entry.startswith("/mnt/"):
+            candidates.append(entry)
+
+    for executable in ("powershell.exe", "cmd.exe", "explorer.exe", "wsl.exe"):
+        resolved = shutil.which(executable)
+        if resolved:
+            candidates.append(str(Path(resolved).parent))
+
+    for entry in (
+        "/mnt/c/WINDOWS/system32",
+        "/mnt/c/WINDOWS",
+        "/mnt/c/WINDOWS/System32/Wbem",
+        "/mnt/c/WINDOWS/System32/WindowsPowerShell/v1.0/",
+        "/mnt/c/WINDOWS/System32/OpenSSH/",
+    ):
+        if Path(entry).exists():
+            candidates.append(entry)
+
+    result: list[str] = []
+    seen = set(path_entries)
+    for entry in candidates:
+        if entry and entry not in seen:
+            seen.add(entry)
+            result.append(entry)
+    return result
+
+
 def _remap_path_for_user(path: str, target_home_dir: str) -> str:
     """Remap *path* from the current user's home to *target_home_dir*.
 
@@ -1699,6 +1739,7 @@ def generate_systemd_unit(system: bool = False, run_as_user: str | None = None)
         node_bin = _remap_path_for_user(node_bin, home_dir)
         path_entries = [_remap_path_for_user(p, home_dir) for p in path_entries]
         path_entries.extend(_build_user_local_paths(Path(home_dir), path_entries))
+        path_entries.extend(_build_wsl_interop_paths(path_entries))
         path_entries.extend(common_bin_paths)
         sane_path = ":".join(path_entries)
         return f"""[Unit]
@@ -1738,6 +1779,7 @@ WantedBy=multi-user.target
     hermes_home = str(get_hermes_home().resolve())
     profile_arg = _profile_arg(hermes_home)
     path_entries.extend(_build_user_local_paths(Path.home(), path_entries))
+    path_entries.extend(_build_wsl_interop_paths(path_entries))
     path_entries.extend(common_bin_paths)
     sane_path = ":".join(path_entries)
     return f"""[Unit]