fix(SWE-INFINITE): add timeout protection to MiniSWE agent

[catoneone]

Summary

• Add per-request timeout (capped at 300s) to LiteLLM completion() calls via model_kwargs, preventing single API calls from hanging indefinitely on cold-starts or queue delays
• Wrap agent.run() with asyncio.wait_for(timeout=self.config.timeout) to enforce a wall-clock deadline on the entire agent loop
• Addresses root cause of Task 143 timeout: the Chutes API model could stall on first request with no timeout protection at any layer

Test plan

• Run MiniSWE agent on a known-good task and verify it completes normally
• Simulate API delay and confirm the agent times out gracefully within config.timeout seconds
• Verify asyncio.TimeoutError is caught by the existing except Exception handler and surfaces in MiniSWEResult.error

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