{
  "analysis": "The changes are scattered but often form contiguous runs within rows. For efficiency, I should identify contiguous runs of changes on each row and write them as blocks. Let me analyze the runs more carefully.",
  "plan": "Analyze contiguous runs of changes to understand the optimal encoding strategy. Then implement the full solution.",
  "commands": [
    {
      "keystrokes": "python3 -c \"\nimport struct\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    \n    frames = []\n    for i in range(n_frames):\n        frames.append(f.read(w*h))\n    \n    # Analyze runs in frame 3->4\n    prev, curr = frames[3], frames[4]\n    changes = [prev[j] != curr[j] for j in range(w*h)]\n    \n    total_chars = 0\n    total_runs = 0\n    \n    for r in range(h):\n        in_run = False\n        run_start = 0\n        for c in range(w):\n            idx = r * w + c\n            if changes[idx]:\n                if not in_run:\n                    in_run = True\n                    run_start = c\n                    total_runs += 1\n            else:\n                if in_run:\n                    in_run = False\n                    run_len = c - run_start\n                    total_chars += run_len\n        if in_run:\n            run_len = w - run_start\n            total_chars += run_len\n    \n    print(f'Frame 3->4: {total_runs} runs, {total_chars} total chars in runs')\n    print(f'Est cost with cursor pos: {total_runs * 7 + total_chars + 1} bytes')\n\"\n",
      "duration": 1.0
    }
  ]
}