Use PEP 735 dependency groups

[adamtheturtle]

Summary

• move development and release tooling from published extras to PEP 735 dependency groups
• update CI, release, contributor, and hook commands to select groups
• regenerate uv.lock where the repository commits one
• preserve genuine runtime/user-facing extras

This keeps development tooling out of package metadata and gives Dependabot and uv one dependency representation to update.

Validation

• repository hooks pass
• uv lock --check passes where applicable