Measures the terminal binary snapshot codecs in both directions
against the same terminal state. Setup feeds a pre-generated VT
stream (for example from ghostty-gen ascii) to a terminal outside
the timed region.
Baseline measurements at this commit (M-series, ReleaseFast, 80x24,
unlimited scrollback, 1 MB corpora, per-loop time with setup
subtracted):
ascii lines 1-70: 34.16 MB encode 92.8 ms decode 119.8 ms
ascii full-wrap: 16.01 MB encode 43.6 ms decode 56.2 ms
utf8: 4.33 MB encode 12.4 ms decode 19.0 ms
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