Screenshots now properly preserve terminal colors:
1. Replay buffer provides raw ANSI data with color codes
2. pyte interprets escape sequences for accurate screen state
3. Rich renders the pyte buffer with colors to SVG
This gives us both accurate terminal state (no creeping/wrapping)
and proper color preservation in screenshots.
Bumps version to 0.1.12.
Replaces simple carriage return handling with pyte terminal emulator
to properly interpret all ANSI escape sequences including cursor
positioning. This fixes the tmux status bar 'creeping up' issue in
screenshots.
Adds pyte dependency to pyproject.toml.
Resolves TODO item #2.
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