Fix uv workspace install and document uv workflow

[Leeaandrob]

Summary

• Fix workspace package metadata so source installs work with uv sync --all-packages.
• Pin the local development interpreter to Python 3.13.
• Document uv CLI install, source sync, uv run, and manual environment activation.

Related Issues

None.

Test Plan

• Source sync passes (uv sync --all-packages)
• CLI version check passes (uv run repowise --version)
• Targeted unit tests pass (uv run pytest tests/unit/generation/test_models.py tests/unit/generation/test_templates.py -q)
• Tests pass (pytest)
• Lint passes (ruff check .) - fails on existing issues outside this change
• Web build passes (npm run build) (no frontend changes)

Checklist

• My code follows the project's code style
• I have added tests for new functionality
• All existing tests still pass for the targeted coverage above
• I have updated documentation if needed