Let me think about this differently. The budget is very tight, so I need to use EL (erase line) commands to clear parts of the screen instead of writing spaces. Let me analyze the change patterns:

```json
{
  "analysis": "Even with space optimization, we're still at 141,575 bytes. I need to use EL (erase line) commands to clear trailing portions of rows efficiently. EL\\x1b[0K clears from cursor to end of line in 4 bytes.",
  "plan": "Implement EL optimization: when a row has trailing changes to spaces, use EL to clear to end of line instead of writing spaces. Also analyze if there are patterns where we can use ED to clear from cursor to end of screen.",
  "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\n# Look for trailing spaces pattern in changes\nprev = b' ' * (width * height)\ntrailing_space_saves = 0\n\nfor frame in frames:\n    for r in range(height):\n        row_start = r * width\n        # Find last non-space change in this row\n        last_change = -1\n        for c in range(width):\n            if prev[row_start + c] != frame[row_start + c]:\n                last_change = c\n        # Check if there are spaces after last change that need clearing\n        if last_change >= 0 and last_change < width - 1:\n            # Check if cells after last_change are spaces in new frame\n            all_spaces_after = True\n            for c in range(last_change + 1, width):\n                if frame[row_start + c] != ord(' '):\n                    all_spaces_after = False\n                    break\n            if all_spaces_after:\n                # Could use EL here\n                spaces_saved = width - last_change - 1\n                trailing_space_saves += spaces_saved\n    prev = frame\n\nprint(f'Potential space savings with EL: {trailing_space_saves}')\nprint(f'New estimated size: {140375 + n_frames - trailing_space_saves}')\n\"\n",
      "duration": 2.0
    }
  ]
}
```