v0.5.0: Text input + keybinding system
Four new modules:
- input.lisp: terminal raw mode, escape sequence parser, key/mouse event
structs, read-event backend integration
- text-input.lisp: single-line text input with cursor, insertion,
deletion, ctrl-A/E/W/U/K, on-submit callback, max-length
- textarea.lisp: multi-line text input with cursor up/down, newline,
backspace joins lines, delete, undo/redo stack
- keybindings.lisp: layered keymap dispatch (global/local/focused),
defkeymap macro, key spec matching with modifier prefixes
60 test assertions, 100% GREEN:
RED: 0/12, 0/27, 0/30 — no tests existed
GREEN: 60/60 across backend (27), box (58), input (60)
Dependencies: sb-posix for terminal raw mode (tcgetattr/tcsetattr)
Test files: 30 input tests covering all widgets and keybinding system
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