fix: use cwd for repo root instead of __file__ parent traversal

When pip-installed, __file__ points into site-packages, not the repo
checkout. Use Path.cwd() so the entry point works from the repo root
regardless of install location.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: sigma

docs/src/toolbox_docs/__main__.py

@@ -7,7 +7,7 @@
 
 
 def main():
-    repo_root = Path(__file__).resolve().parent.parent.parent.parent
+    repo_root = Path.cwd()
     packages_dir = repo_root / "packages"
     out_dir = repo_root / "docs" / "_site"
     out_dir.mkdir(parents=True, exist_ok=True)