fix: add temporalio[opentelemetry] extra to resolve ModuleNotFoundError

Tutorial agents were failing with `ModuleNotFoundError: No module named
'opentelemetry.sdk'` because `opentelemetry-sdk` was an accidental
transitive dep of `ddtrace` in the old resolution graph. Removing the
starlette<1.0.0 cap changed uv's resolution for tutorial `uv run --with`
environments, exposing the missing explicit dependency.

Declaring the `[opentelemetry]` extra on temporalio makes the dependency
explicit so all environments resolve it correctly.

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

Author: scale-ballen

pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [
     "pyyaml>=6.0.2,<7",
     "jsonschema>=4.23.0,<5",
     "jsonref>=1.1.0,<2",
-    "temporalio>=1.18.2,<2",
+    "temporalio[opentelemetry]>=1.18.2,<2",
     "aiohttp>=3.10.10,<4",
     "redis>=5.2.0,<6",
     "litellm>=1.66.0,<2",