Write build info

[myanvoos]

This draft PR writes build_info.json to each sample's directory, containing the Cloud Build ID of each agent instances within each cycle.

[myanvoos]

/gcbrun exp -n mv -m vertex_ai_gemini-2-flash-chat -ag

[github-actions]

Requested GKE Job: ofg-pr-1186-mv

JOB: https://console.cloud.google.com/kubernetes/job/us-central1-c/llm-experiment/default/ofg-pr-1186-mv
REPORT: https://llm-exp.oss-fuzz.com/Result-reports/ofg-pr/2025-11-13-1186-mv-comparison/index.html
BUCKET: https://console.cloud.google.com/storage/browser/oss-fuzz-gcb-experiment-run-logs/Result-reports/ofg-pr/2025-11-13-1186-mv-comparison
BUCKET (GS): gs://oss-fuzz-gcb-experiment-run-logs/Result-reports/ofg-pr/2025-11-13-1186-mv-comparison

[myanvoos]

/gcbrun exp -n mv -m vertex_ai_gemini-2-flash-chat -ag

[github-actions]

Requested GKE Job: ofg-pr-1186-mv

JOB: https://console.cloud.google.com/kubernetes/job/us-central1-c/llm-experiment/default/ofg-pr-1186-mv
REPORT: https://llm-exp.oss-fuzz.com/Result-reports/ofg-pr/2025-11-27-1186-mv-comparison/index.html
BUCKET: https://console.cloud.google.com/storage/browser/oss-fuzz-gcb-experiment-run-logs/Result-reports/ofg-pr/2025-11-27-1186-mv-comparison
BUCKET (GS): gs://oss-fuzz-gcb-experiment-run-logs/Result-reports/ofg-pr/2025-11-27-1186-mv-comparison