fix(cookbook): stop local Windows process trees

Track the inner Bash runner PID for local Windows Cookbook tasks and stop the full child process tree during cleanup.

routes/cookbook_routes.py

@@ -354,7 +354,11 @@ def setup_cookbook_routes() -> APIRouter:
             # all output to the log the poller reads. Paths handed to bash use
             # POSIX form + shell-quoting so drive paths / spaces survive.
             inner = TMUX_LOG_DIR / f"{session_id}_run.sh"
-            inner.write_text("\n".join(bash_lines) + "\n", encoding="utf-8")
+            pp = shlex.quote(pid_path.as_posix())
+            inner.write_text(
+                f"printf '%s\\n' \"$$\" > {pp}\n" + "\n".join(bash_lines) + "\n",
+                encoding="utf-8",
+            )
             lp = shlex.quote(log_path.as_posix())
             ip = shlex.quote(inner.as_posix())
             script_path = TMUX_LOG_DIR / f"{session_id}.sh"