feat: auto-publish Issue when leaderboard #1 changes (#219)

[zqleslie]

🎯 What this does

Implements #219 — automatically creates a GitHub Issue when the leaderboard #1 position changes.

Changes

1. scripts/gen_leaderboard.py — Added leaderboard_meta.json tracking

   • Records the current feedback: rag-retrieval-quality ✓ #1 agent name and score after each run
   • Uses atomic tmp-then-rename writes to avoid corrupt meta files
   • Prints a notification message when feedback: rag-retrieval-quality ✓ #1 changes (for the watch script to detect)

2. scripts/leaderboard_watch.py — Integrated #1 change detection with Issue creation

   • After computing the contributor leaderboard, reads bench_leaderboard.json to check if bench feedback: rag-retrieval-quality ✓ #1 changed
   • Also reads leaderboard_meta.json for previous bench feedback: rag-retrieval-quality ✓ #1 comparison
   • Creates a formatted Issue with both old and new feedback: rag-retrieval-quality ✓ #1 + top 20 leaderboard table
   • Updates leaderboard_meta.json atomically after each run

3. data/leaderboard_meta.json — Initial empty state file (tracks feedback: rag-retrieval-quality ✓ #1 across runs)

How it works

leaderboard-watch.yml (cron) → leaderboard_watch.py
  ├── Compute contributor leaderboard (GraphQL commits)
  ├── Read bench_leaderboard.json (from gen_leaderboard.py)
  ├── Compare #1 vs leaderboard_meta.json
  └── If #1 changed → create Issue + update meta

Acceptance Criteria

• Issue created only when feedback: rag-retrieval-quality ✓ #1 changes (not on every run)
• Issue includes both new and previous leader with scores
• leaderboard_meta.json updated atomically (tmp-then-rename)
• Fork used, DCO sign-off in commit message

Testing

• python3 scripts/gen_leaderboard.py --dry-run works without bench data
• python3 scripts/leaderboard_watch.py --dry-run prints notification preview
• Both scripts are backward-compatible (existing behavior unchanged when meta doesn't exist)

Signed-off-by: zqleslie zqleslie@users.noreply.github.com

[github-actions]

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[Ikalus1988]

Clean implementation of #219. Approaches:

• gen_leaderboard.py tracks #1 in leaderboard_meta.json (atomic write)
• leaderboard_watch.py detects changes + creates notification issue
• Also monitors bench leaderboard changes
• Atomic tmp-then-replace pattern for meta file

One minor note: load_meta()/save_meta() are duplicated in both files — could be extracted to a shared util later, but not blocking.

Approved. 🚀