Track uv.lock for reproducible dev environments

Reverses the prior "library — consumers resolve their own deps" stance.
The lockfile doesn't leak into the published wheel/sdist (uv strips it
from distribution metadata), so PyPI consumers still resolve via the
pyproject.toml version specifiers. Tracking it gives dev/CI a stable
pinned set of dev tools (pytest, ruff, mypy) and transitive deps, and
matches what python-dqlite-dbapi already does.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: antoineleclair

.gitignore

@@ -25,9 +25,6 @@ wheels/
 venv/
 ENV/
 
-# uv lock file (library — consumers resolve their own deps)
-uv.lock
-
 # IDE
 .idea/
 .vscode/