Enhance OpenRouter backend for extended parameters

[matdev83]

Summary

• normalize and forward OpenRouter-specific request parameters (prediction, transforms, provider, models, etc.) when building chat payloads
• add a regression test covering the extended OpenRouter payload handling and extra_body precedence

Testing

• ./.venv/Scripts/python.exe -m pytest tests/unit/openrouter_connector_tests/test_payload_construction_and_headers.py

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📥 Commits

Reviewing files that changed from the base of the PR and between c03159e and a88850c.

📒 Files selected for processing (2)

• src/connectors/openrouter.py (2 hunks)
• tests/unit/openrouter_connector_tests/test_payload_construction_and_headers.py (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/enhance-openrouter-backend-implementation-k35v98

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Access OpenRouter fields missing from ChatRequest

The new payload section assumes the request model already defines attributes such as repetition_penalty, top_logprobs, min_p, transforms, etc. However ChatRequest/CanonicalChatRequest in src/core/domain/chat.py do not declare these fields and Pydantic ignores unknown keys when copying. As a result a normal call hits domain_request.repetition_penalty here and raises AttributeError, so every OpenRouter chat request crashes before sending the HTTP call. The parameters need to be added to the domain model or accessed via getattr(..., None) to tolerate missing fields.

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