{
  "analysis": "Still at 256K bytes. Let me try a completely different approach: use absolute positioning for each individual changed cell (not runs), and use EL+rewrite only when it's clearly cheaper.",
  "plan": "Implement a simpler encoder using absolute positioning for each changed cell individually.",
  "commands": [
    {
      "keystrokes": "cat > /app/termzip_ansi.py << 'EOF'\nimport struct\nimport sys\n\ndef main():\n    if len(sys.argv) != 2:\n        sys.exit(1)\n    \n    with open(sys.argv[1], 'rb') as f:\n        magic = f.read(4)\n        if magic != b'TZA1':\n            sys.exit(1)\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    out = []\n    \n    # Frame 0: write non-space cells individually\n    for r in range(h):\n        row = frames[0][r*w:(r+1)*w]\n        for c in range(w):\n            if row[c] != 32:\n                out.append(f'\\x1b[{r+1};{c+1}H')\n                out.append(chr(row[c]))\n    out.append('\\x1e')\n    \n    # Subsequent frames\n    for i in range(1, n_frames):\n        # Find changed cells\n        changed = []\n        for r in range(h):\n            prev_row = frames[i-1][r*w:(r+1)*w]\n            curr_row = frames[i][r*w:(r+1)*w]\n            for c in range(w):\n                if prev_row[c] != curr_row[c]:\n                    changed.append((r, c, curr_row[c]))\n        \n        # Group changes by row and decide EL+rewrite vs individual\n        row_changes = {}\n        for r, c, val in changed:\n            row_changes.setdefault(r, []).append((c, val))\n        \n        for r, items in row_changes.items():\n            curr_row = frames[i][r*w:(r+1)*w]\n            # EL+rewrite cost: ESC[r;1H + ESC[2K + row\n            cost_erase = 3 + len(str(r+1)) + 1 + 1 + 4 + w\n            # Individual cost: sum(ESC[r;cH + char)\n            cost_indiv = sum(3 + len(str(r+1)) + 1 + len(str(c+1)) + 1 + 1 for c, _ in items)\n            \n            if cost_erase < cost_indiv:\n                out.append(f'\\x1b[{r+1};1H')\n                out.append('\\x1b[2K')\n                out.append(curr_row.decode('latin1'))\n            else:\n                for c, val in sorted(items):\n                    out.append(f'\\x1b[{r+1};{c+1}H')\n                    out.append(chr(val))\n        \n        out.append('\\x1e')\n    \n    sys.stdout.write(''.join(out))\n\nif __name__ == '__main__':\n    main()\nEOF\n",
      "duration": 0.5
    }
  ]
}