refactor(model)!: remove obsolete llm polling context fields

[QuantumGhost]

AI disclosure: This PR was primarily drafted with Codex using GPT-5.4.
I have reviewed and edited the final diff, and I am responsible for the content.

Related Issue

Closes #349

Summary

• remove workflow_run_id and node_id from the LLM polling daemon request schema
• remove the same obsolete fields from the LargeLanguageModel polling method signatures
• stop forwarding those fields in PluginExecutor
• add a clear migration guard for legacy polling providers that still implement the old keyword-only parameters
• update polling tests to cover the narrowed contract and the legacy-signature failure mode

Compatibility Impact

This is a breaking API change for plugin authors who implement polling-capable LargeLanguageModel providers against the SDK. Existing implementations must remove workflow_run_id and node_id from _start_polling and _check_polling before upgrading.

Target release: the next incompatible SDK release after 0.9.0. The exact version number is still to be decided by maintainers.

Validation

• uv run pytest tests/test_model_polling.py -q
• just check
• just build
• just test still reports the pre-existing integration environment error in tests/integration/test_invoke_llm.py::test_invoke_llm, where python -m tests.__mock_server fails with ModuleNotFoundError: No module named 'tests' in this worktree\n\n# Pull Request Checklist\n\n## Compatibility Check\n\n- [x] I have checked whether this change affects the backward compatibility of the plugin declared in README.md\n- [x] I have checked whether this change affects the forward compatibility of the plugin declared in README.md\n- [ ] If this change introduces a breaking change, I have discussed it with the project maintainer and specified the release version in the README.md\n- [ ] I have described the compatibility impact and the corresponding version number in the PR description\n- [x] I have checked whether the plugin version is updated in the README.md\n\n## Available Checks\n\n- [x] just build has passed\n- [x] Relevant documentation has been updated (if necessary)

[gemini-code-assist]

Code Review

This pull request removes the obsolete workflow_run_id and node_id parameters from the LLM polling interface across requests, executors, and the LargeLanguageModel base class. It also adds a runtime check to raise a migration error if legacy plugins still implement the outdated polling interface, and updates the test suite accordingly. Feedback on the changes suggests keeping json_schema as a keyword-only argument in start_polling to maintain consistency with _start_polling and prevent positional argument abuse.

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