The earlyInput capture's escape sequence detection was too simplistic — it
only checked if the byte after ESC fell in 0x40-0x7E range, treating it as
a terminator. This caused DCS sequences (e.g. XTVERSION `\x1bP>|iTerm2
3.6.4\x1b\\`) and CSI parameter sequences (e.g. DA1 `\x1b[?64;...c`) to
partially leak into the input buffer as `>|iTerm2 3.6.4?64;1;2;4;6;17;18;21;22c`.
Fix by handling each escape sequence type per ECMA-48:
- CSI (`ESC [`): skip parameter + intermediate bytes, then final byte
- DCS/OSC/SOS/PM (`ESC P/]/X/^`): scan to BEL or ST terminator
- Other: keep single-byte skip
Closes#171
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
