chore: stop tracking uv.lock (project uses requirements*.lock from rye)

uv.lock was added on the integrated branch but is not produced by codegen
and is not referenced by any script, CI, or pyproject.toml. The project's
canonical lockfiles are requirements.lock and requirements-dev.lock (managed
by rye). Tracking uv.lock made the custom-code diff balloon by ~1.2k lines
unnecessarily.

Author: NormallyGaussian

.gitignore

@@ -14,3 +14,4 @@ dist
 .envrc
 codegen.log
 Brewfile.lock.json
+uv.lock