Change agent lookup endpoint from GET to POST method

[devin-ai-integration]

Change agent lookup endpoint from GET to POST method

Summary

This PR changes the HTTP request method from GET to POST for the agent lookup endpoint in the Python SDK. This aligns with the backend API modification made in vlm-lab repository (PR #978) where the /agent/lookup endpoint was changed from GET to POST method.

Files Changed:

• vlmrun/client/agent.py: Updated the get() method to use POST instead of GET for the agent lookup request

Impact: This is a breaking change that affects the client.agent.get() method calls, but the SDK interface remains unchanged from the user perspective.

Review & Testing Checklist for Human

• Verify backend API is ready: Confirm that vlm-lab PR #978 has been deployed and the backend /agent/lookup endpoint now accepts POST requests
• Test real API calls: Run integration tests or manual verification that client.agent.get(name="..."), client.agent.get(id="..."), and client.agent.get(prompt="...") work correctly against the live API
• Check deployment timing: Ensure this SDK change is deployed after (or simultaneously with) the backend API change to avoid breaking existing functionality

Notes

• All unit tests pass (1 unrelated OpenAI test failure)
• Linting passes with pre-commit hooks
• The change only affects the HTTP method; all input validation and response handling remains the same
• Requested by @Mirajul-Mohin via Slack
• Link to Devin session: https://app.devin.ai/sessions/177bfc04f7074e9293229e0d090d2e76

[devin-ai-integration]

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