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Verify agent 'code-review-agent' capability: code_generation

This is a capability verification task for agent 'code-review-agent'. Test prompt: Generate a complete FastAPI endpoint `POST /webhook` that validates an HMAC-SHA256 signature from the `X-Signature` header before processing the request body. Success criteria: Response contains a FastAPI route with HMAC validation and 403 on failure. Instructions: 1. Send the test prompt to the agent via AP2 or direct invocation. 2. Evaluate the response against the success criteria. 3. Return a JSON report: {"agent": "code-review-agent", "capability": "code_generation", "passed": true/false, "response_excerpt": "first 200 chars", "reason": "..."}.