ci: add --frozen flag to all uv commands in workflows

Ensure all uv invocations in GitHub workflows use the --frozen flag
for deterministic builds and to prevent lock file updates in CI.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: dsp-ant

.github/workflows/publish-docs-manually.yml

@@ -30,4 +30,4 @@ jobs:
             mkdocs-material-
 
       - run: uv sync --frozen --group docs
-      - run: uv run --no-sync mkdocs gh-deploy --force
+      - run: uv run --frozen --no-sync mkdocs gh-deploy --force

.github/workflows/publish-pypi.yml

@@ -22,7 +22,7 @@ jobs:
         run: uv python install 3.12
 
       - name: Build
-        run: uv build
+        run: uv build --frozen
 
       - name: Upload artifacts
         uses: actions/upload-artifact@v4
@@ -79,4 +79,4 @@ jobs:
             mkdocs-material-
 
       - run: uv sync --frozen --group docs
-      - run: uv run --no-sync mkdocs gh-deploy --force
+      - run: uv run --frozen --no-sync mkdocs gh-deploy --force

.github/workflows/shared.yml

@@ -44,5 +44,5 @@ jobs:
         run: uv sync --frozen --all-extras --python ${{ matrix.python-version }}
 
       - name: Run pytest
-        run: uv run --no-sync pytest
+        run: uv run --frozen --no-sync pytest
     continue-on-error: true