fix(python): upgrade from 3.14.0rc2 to 3.14.0 stable release

Python 3.14.0 stable was released on 2025-10-07, replacing the release
candidate versions. The project was using 3.14.0rc2 (release candidate 2)
instead of the final stable release.

Changes:
- Installed Python 3.14.0 stable via uv python install
- Updated .python-version from "3.14" to "3.14.0" (pinned stable)
- Recreated dev venv at ~/.venvs/dev with Python 3.14.0
- Verified: python --version now shows "Python 3.14.0" (not rc2)

Result: All Python commands now use the stable 3.14.0 release instead of
the release candidate.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: AI Assistant

.python-version

@@ -1 +1 @@
-3.14
+3.14.0