Add native Windows compatibility for config, bootstrap, and CLI.

Support profile-based config resolution with auto-selection of a sole profile,
native IPA.exe -n bootstrap on Windows, platform-aware process cleanup, and
Windows-friendly userdata backup path inference.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/plugin_helper/userdata.py

@@ -6,7 +6,6 @@ import shutil
 import tarfile
 from datetime import datetime, timezone
 from pathlib import Path
-from tempfile import NamedTemporaryFile
 from typing import Any, Callable
 
 from .fsutil import sha256_file
@@ -62,25 +61,24 @@ def backup_userdata(instance: str, instance_path: Path, state_root: Path) -> dic
     }
 
     destination.parent.mkdir(parents=True, exist_ok=True)
+    manifest_path = destination.parent / f".{destination.name}.manifest.json"
+    manifest_path.write_text(json.dumps(manifest, indent=2, sort_keys=True) + "\n", encoding="utf-8")
     with tarfile.open(destination, "w:gz") as archive:
         archive.add(source, arcname="UserData")
-        with NamedTemporaryFile("w", encoding="utf-8", suffix=".json") as handle:
-            json.dump(manifest, handle, indent=2, sort_keys=True)
-            handle.write("\n")
-            handle.flush()
-            archive.add(handle.name, arcname="manifest.json")
+        archive.add(manifest_path, arcname="manifest.json")
+    manifest_path.unlink(missing_ok=True)
     return {"archive": str(destination), "manifest": manifest}
 
 
 def infer_windows_appdata_path(instance_path: Path) -> Path:
     parts = instance_path.resolve().parts
     try:
-        users_index = parts.index("Users")
+        bsmanager_index = parts.index("BSManager")
     except ValueError as exc:
         raise ValueError(f"cannot infer Windows user profile from instance path: {instance_path}") from exc
-    if users_index + 1 >= len(parts):
+    if bsmanager_index < 2 or parts[bsmanager_index - 2] != "Users":
         raise ValueError(f"cannot infer Windows user profile from instance path: {instance_path}")
-    profile = Path(*parts[: users_index + 2])
+    profile = Path(*parts[:bsmanager_index])
     return profile / "AppData" / "LocalLow" / "Hyperbolic Magnetism" / "Beat Saber"