{
  "analysis": "Now I understand the constraints:\n- 80x24 terminal (1920 bytes per frame)\n- 1200 frames\n- Max bytes budget: 69000 (~57.5 bytes per frame average)\n\nThis means I must use delta encoding - only output what changed between frames. If I output the full screen each frame, it would be 2.3MB, far exceeding the 69KB budget.",
  "plan": "Create termzip_ansi.py that:\n1. Reads the binary TZA file\n2. Compares each frame to the previous one\n3. Outputs only changed characters with efficient cursor positioning\n4. Uses 0x1e as frame delimiter\n\nI'll optimize by tracking cursor position and minimizing escape sequences.",
  "commands": [
    {
      "keystrokes": "cat > /app/termzip_ansi.py << 'EOF'\n#!/usr/bin/env python3\nimport struct\nimport sys\n\ndef read_tza(filename):\n    with open(filename, 'rb') as f:\n        magic = f.read(4)\n        if magic != b'TZA1':\n            raise ValueError(f'Invalid magic: {magic}')\n        width, height = struct.unpack('<HH', f.read(4))\n        n_frames, max_bytes = struct.unpack('<II', f.read(8))\n        frames = []\n        for _ in range(n_frames):\n            frame_data = f.read(width * height)\n            frames.append(frame_data)\n        return width, height, n_frames, max_bytes, frames\n\ndef main():\n    if len(sys.argv) != 2:\n        sys.stderr.write(f'Usage: {sys.argv[0]} <frames.tza>\\n')\n        sys.exit(1)\n    \n    filename = sys.argv[1]\n    width, height, n_frames, max_bytes, frames = read_tza(filename)\n    \n    # Previous frame starts as all spaces\n    prev_frame = b' ' * (width * height)\n    output = bytearray()\n    \n    # Track cursor position (1-indexed)\n    cur_row, cur_col = 1, 1\n    \n    def move_to(row, col):\n        nonlocal cur_row, cur_col, output\n        row, col = row + 1, col + 1  # Convert to 1-indexed\n        if row == cur_row and col == cur_col:\n            return\n        output.extend(b'\\x1b[')\n        output.extend(str(row).encode())\n        output.extend(b';')\n        output.extend(str(col).encode())\n        output.extend(b'H')\n        cur_row, cur_col = row, col\n    \n    for frame in frames:\n        for r in range(height):\n            row_start = r * width\n            for c in range(width):\n                pos = row_start + c\n                if prev_frame[pos] != frame[pos]:\n                    # Move cursor to this position\n                    move_to(r, c)\n                    # Output the character\n                    ch = frame[pos:pos+1]\n                    output.extend(ch)\n                    cur_col += 1\n                    if cur_col > width:\n                        cur_col = 1\n                        cur_row += 1\n        # Frame delimiter\n        output.append(0x1e)\n        prev_frame = frame\n        # Reset cursor tracking for next frame\n        cur_row, cur_col = 1, 1\n    \n    sys.stdout.buffer.write(output)\n\nif __name__ == '__main__':\n    main()\nEOF\n",
      "duration": 0.5
    },
    {
      "keystrokes": "python3 /app/termzip_ansi.py /app/frames.tza | wc -c\n",
      "duration": 2.0
    }
  ]
}