Wait, this seems impossible! The minimum output (changed chars + delimiters) is 158,516 bytes but budget is 69,000. Let me re-read the problem...

Oh! I can use ED/EL (erase display/line) commands to clear parts of the screen instead of writing spaces. Let me analyze the changes to see if this helps:

```json
{
  "analysis": "The minimum output of 158,516 bytes exceeds the 69,000 budget. But I can use ED/EL erase commands to clear parts of the screen instead of writing space characters. This could save bytes when cells change to spaces.",
  "plan": "Analyze how many changes are 'to space' vs 'from space' and see if using EL (erase line) can save bytes.",
  "commands": [
    {
      "keystrokes": "python3 -c \"\nimport struct\nwith open('/app/frames.tza', 'rb') as f:\n    magic = f.read(4)\n    width, height = struct.unpack('<HH', f.read(4))\n    n_frames, max_bytes = struct.unpack('<II', f.read(8))\n    frames = [f.read(width * height) for _ in range(n_frames)]\n\nprev = b' ' * (width * height)\nto_space = 0\nfrom_space = 0\nto_non_space = 0\nfrom_non_space = 0\n\nfor frame in frames:\n    for i in range(width * height):\n        if prev[i] != frame[i]:\n            if prev[i] == ord(' '):\n                from_space += 1\n            else:\n                from_non_space += 1\n            if frame[i] == ord(' '):\n                to_space += 1\n            else:\n                to_non_space += 1\n    prev = frame\n\nprint(f'Changes from space: {from_space}')\nprint(f'Changes to space: {to_space}')\nprint(f'Changes from non-space: {from_non_space}')\nprint(f'Changes to non-space: {to_non_space}')\nprint(f'\\nIf we can avoid writing spaces: {to_non_space + n_frames} bytes')\nprint(f'Budget: {max_bytes}')\nprint(f'Would still need: {(to_non_space + n_frames) - max_bytes} more bytes')\n\"\n",
      "duration": 2.0
    }
  ]
}
```