fix(update): stop Windows updates from locking their own launcher

gateway/slash_commands.py

@@ -5958,8 +5958,11 @@ async def _handle_update_command(self, event: MessageEvent) -> str:
                 import textwrap
                 from hermes_cli._subprocess_compat import windows_detach_popen_kwargs
 
-                # hermes_cmd is a list of argv parts we can pass directly
-                # (no shell-quoting needed).
+                # Invoke the updater as a module under this interpreter rather
+                # than through hermes_cmd (venv\Scripts\hermes.exe): the shim
+                # launcher holds its own file open for the whole run, and the
+                # update has to replace it. Going through python.exe maps no
+                # shim, so the entry points can be rewritten freely.
                 helper = textwrap.dedent(
                     """
                     import os, subprocess, sys
@@ -5979,7 +5982,8 @@ async def _handle_update_command(self, event: MessageEvent) -> str:
                     [
                         sys.executable, "-c", helper,
                         str(output_path), str(exit_code_path),
-                        *hermes_cmd, "update", "--gateway",
+                        sys.executable, "-m", "hermes_cli.main",
+                        "update", "--gateway",
                     ],
                     stdout=subprocess.DEVNULL,
                     stderr=subprocess.DEVNULL,

hermes_cli/_install_repair.py

@@ -92,7 +92,9 @@ def _resolve_install_target(root: Path) -> tuple[list[str], dict | None]:
     """
     uv_bin = _er._find_uv_binary()
     if uv_bin:
-        env = {**os.environ, "VIRTUAL_ENV": str(root / "venv")}
+        from hermes_constants import project_venv_dir
+
+        env = {**os.environ, "VIRTUAL_ENV": str(project_venv_dir(root) or root / "venv")}
         if _is_termux_env(env):
             env.pop("PYTHONPATH", None)
             env.pop("PYTHONHOME", None)
@@ -102,13 +104,14 @@ def _resolve_install_target(root: Path) -> tuple[list[str], dict | None]:
 
 def _venv_scripts_dir(root: Path) -> Path | None:
     """Project venv Scripts/bin dir, when present. stdlib-only."""
-    venv_dir = root / "venv"
-    if not venv_dir.is_dir():
-        return None
-    # hermes_constants is stdlib-only, so the canonical layout helper is safe
+    # hermes_constants is stdlib-only, so the canonical layout helpers are safe
     # to use from this corrupted-venv repair path (#76105: never open-code
     # the Scripts/bin split).
-    from hermes_constants import venv_bin_dir
+    from hermes_constants import project_venv_dir, venv_bin_dir
+
+    venv_dir = project_venv_dir(root)
+    if venv_dir is None:
+        return None
 
     scripts = venv_bin_dir(venv_dir, windows=_is_windows())
     return scripts if scripts.is_dir() else None