fix(release): install examples dep group in release workflow (#49)

The release workflow's ``Sync deps`` step ran
``uv sync --frozen --all-extras`` without ``--group examples``, so
``openai`` was missing from the venv and the four
``tests/test_examples_smoke.py`` cases failed at module-load time with
``ModuleNotFoundError``. ``ci.yml`` has been doing the right thing
since #43; this brings ``release.yml`` in line.

Surfaced when the v0.6.0 tag fired the workflow for the first time
since #43 landed. The drift sat dormant because release.yml only runs
on tag pushes.

Author: chris-colinsky

.github/workflows/release.yml

@@ -38,8 +38,11 @@ jobs:
       # ``Unknown`` for every OTel-typed expression in
       # ``tests/{conformance,unit}/test_observability*.py`` and the
       # whole job fails (pyright doesn't honor pytest.importorskip).
+      # ``--group examples`` mirrors ``ci.yml`` so the
+      # ``tests/test_examples_smoke.py`` modules can import ``openai``
+      # at load time (the examples themselves are runnable demos).
       - name: Sync deps
-        run: uv sync --frozen --all-extras
+        run: uv sync --frozen --all-extras --group examples
 
       # Fail fast if pyproject.toml's version doesn't match the pushed
       # tag. Both sides go through `packaging.version.Version` so PEP 440