- Add %read-digits to read multi-digit parameters from raw terminal bytes
- Add %parse-sgr-mouse to decode ESC[<Cb;Cx;CyM/m SGR mouse sequences
into mouse-event structs with :press/:release type and :left/:middle/
:right/:scroll-up/:scroll-down/:drag button classification
- Modified parse-csi-sequence to detect the < marker (0x3C) and
delegate to %parse-sgr-mouse instead of treating it as key input
- Coordinates converted from 1-based (terminal protocol) to 0-based
(framebuffer convention)
- All 12 test suites pass at 100% (461 checks, no regressions)
- Org source (text-input.org) updated as the source of truth
