ci: fix docs build by skipping Rust compilation

uv sync --group docs was trying to build the Rust extension on Linux,
which fails with macOS-only linker flags. mkdocstrings uses static
analysis (griffe) and doesn't need the compiled extension.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: erichutchins

.github/workflows/docs.yml

@@ -26,5 +26,5 @@ jobs:
           path: .cache
           restore-keys: |
             mkdocs-material-
-      - run: uv sync --group docs
+      - run: uv sync --group docs --no-install-project
       - run: uv run mkdocs gh-deploy --force