test: add e2e test for auto model

[steebchen]

Summary

• Adds an end-to-end test for the auto model with reasoning_effort parameter
• Verifies that the response includes reasoning_content when using the auto model
• Ensures proper setup of organization credits and project mode for auto model routing
• Validates response structure including usage tokens and reasoning tokens
• Confirms that the auto model routes to a reasoning-capable model and returns expected logs

Changes

Test Enhancements

• Added a new test case in api.e2e.ts:
  • Sets organization credits and project mode to credits to enable auto model routing
  • Sends a chat completion request with model: "auto" and reasoning_effort: "medium"
  • Checks HTTP status and validates the response JSON structure
  • Confirms presence and type of reasoning_content in the response message
  • Validates usage tokens including optional reasoning tokens
  • Verifies logs to ensure correct model routing and provider usage

Test plan

• Run the new e2e test to verify that the auto model returns reasoning content
• Confirm that all assertions on response structure and logs pass successfully
• Ensure no regressions in existing e2e tests

🌿 Generated by Terry

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ℹ️ Tag @terragon-labs to ask questions and address PR feedback

📎 Task: https://www.terragonlabs.com/task/e80df600-c79e-412c-876d-2fbc3f1b91e2

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✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch terragon/test-auto-model-reasoning-content

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