nx_input.nx

nx_input.nx -- terminal input primitives (line + byte read from stdin). The user-interaction layer's INPUT side. Reads bytes from stdin (fd=0) via sys_read; decodes basic escape sequences when in raw mode (see nx_termios.nx for raw-mode entry). Companion to nx_tty.nx (output side). Together they close the substrate-to-user gap. Why this exists (per user 2026-05-13): user said "if not build it" when the layer audit showed UI was the missing tier. This is the foundation; widgets / event loop can build on these primitives. Standard usage: - nx_input_read_line(buf, max) -- cooked-mode line read - nx_input_read_byte() -- single byte (works in any mode) - nx_input_read_key() -- decode arrow keys etc. (raw mode) genealogy_id: ecma_48_1976_ansi_escape + readline_lineage lineage_id: stdin_byte_stream + escape_sequence_decode axioms: NX_AX_LOGIC_EXCLUDED_MIDDLE (each byte is or isn't a key event prefix; no third state)