Add plugin helper with agent skill for updating plugins

src/plugin_helper/config.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+import os
+from pathlib import Path
+
+
+DEFAULT_INSTANCES_ROOT = Path("/home/pleb/Windows/Users/pleb/BSManager/BSInstances")
+
+
+def instances_root(value: str | None = None) -> Path:
+    raw = value or os.environ.get("PLUGIN_HELPER_INSTANCES_ROOT")
+    return Path(raw).expanduser() if raw else DEFAULT_INSTANCES_ROOT
+
+
+def state_root(value: str | None = None) -> Path:
+    if value:
+        return Path(value).expanduser()
+    xdg_state = os.environ.get("XDG_STATE_HOME")
+    base = Path(xdg_state).expanduser() if xdg_state else Path.home() / ".local" / "state"
+    return base / "plugin-helper"
+
+
+def repo_root() -> Path:
+    return Path(__file__).resolve().parents[2]