{
  "analysis": "A frame with 4 changes costs 28-32 bytes, which is under the 57.5 byte/frame budget. The problem is frames with 260-370 changes. Let me analyze those frames to see if they're changing specific rows that could be handled with EL+rewrite.",
  "plan": "Analyze the large-change frames (260-370 changes) to understand their row change pattern and see if EL+rewrite would be more efficient.",
  "commands": [
    {
      "keystrokes": "python3 << 'PYEOF'\nimport struct\n\nwith open('/app/frames.tza', 'rb') as f:\n    f.read(4)\n    w, h = struct.unpack('<HH', f.read(4))\n    n_frames, max_bytes = struct.unpack('<II', f.read(8))\n    frames = [f.read(w*h) for _ in range(n_frames)]\n\n# Find a frame with ~300 changes\nfor i in range(1, n_frames):\n    changes = [(j//w, j%w) for j in range(w*h) if frames[i-1][j] != frames[i][j]]\n    if 280 <= len(changes) <= 320:\n        print(f'Frame {i}: {len(changes)} changes')\n        \n        # Group by row\n        by_row = {}\n        for r, c in changes:\n            by_row.setdefault(r, []).append(c)\n        \n        print(f'  Changed rows: {sorted(by_row.keys())}')\n        for r in sorted(by_row.keys()):\n            cols = sorted(by_row[r])\n            # Find runs\n            runs = []\n            if cols:\n                run_start = cols[0]\n                run_end = cols[0]\n                for c in cols[1:]:\n                    if c == run_end + 1:\n                        run_end = c\n                    else:\n                        runs.append((run_start, run_end))\n                        run_start = run_end = c\n                runs.append((run_start, run_end))\n            print(f'    Row {r}: {len(cols)} changes, {len(runs)} runs: {runs}')\n        break\nPYEOF\n",
      "duration": 3.0
    }
  ]
}