Add skill_generation_state to BaseAgent test fixture

[Chen-ROE]

Summary

Release v1.1.12 (#76, generated from roe-main 1-0-96) adds a required, nullable skill_generation_state field to BaseAgent. The hand-written _base_agent_json() fixture in tests/unit/test_agents_wrapper_transport.py predates it, so the regenerated BaseAgent.from_dict raises KeyError: 'skill_generation_state' and the test job on #76 fails.

This adds the key (as None) to the fixture. Landing it on main first is required: the release bot rebuilds the release-sdk-python-* branch from main on every re-run, so a commit pushed directly onto #76 would be overwritten.

Test Plan

• Regenerated the SDK locally from the 1-0-96 spec (bash scripts/generate-sdk), ran uv run pytest: 1 failed / 66 passed without this change, 67 passed with it.
• CI green on this PR.
• After merge, re-run the roe-main 1-0-96 release workflow and confirm Release v1.1.12 #76 goes green.

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

Updates the hand-written BaseAgent response fixture to include the newly required nullable skill_generation_state field.

• Keeps the fixture aligned with the regenerated SDK model expected in the upcoming release.
• Uses None to represent the nullable API value.

Confidence Score: 5/5

The PR appears safe to merge and introduces no actionable correctness, security, or maintainability issues.

The fixture-only change uses the intended nullable value and remains compatible with both the current model’s additional-property handling and the regenerated model described by the PR.

Important Files Changed

Filename	Overview
tests/unit/test_agents_wrapper_transport.py	Adds the nullable skill_generation_state key to the BaseAgent transport-test fixture.

_{Reviews (1): Last reviewed commit: "Add skill_generation_state to BaseAgent ..." | Re-trigger Greptile}

[Chen-ROE]

Superseded: the one-line fixture change was pushed directly onto #76 (release-sdk-python-1-0-96). Note #76 must merge before the roe-main release workflow is re-run, since the release bot rebuilds that branch from main on each run.