add max_iterations hook to the drafter

[derekmisler]

Summary

Add max_iterations hook to the drafter agent and improve timeout handling to prevent LLM calls from consuming the entire job budget. Also adds date timestamps to agent outputs for better debugging.

Changes

• Drafter agent: Add max_iterations: 40 hook to before_llm_call to prevent runaway iterations
• Verifier agent: Add matching max_iterations: 40 hook for consistency
• Job timeout: Set workflow job timeout to 35 minutes to enforce a hard deadline
• LLM call timeout: Add 180-second (3 min) timeout to haiku calls to prevent hangs from consuming the job budget
• Agent timestamps: Add add_date: true to root, drafter, and verifier agents for better traceability

Test plan

• Verify the PR review workflow completes within the 35-minute timeout
• Confirm that individual LLM calls timeout after 3 minutes if they hang
• Check that agent outputs now include timestamps for debugging

Closes: https://github.com/docker/gordon/issues/557