nx_grammar.nx

nx_grammar.nx -- WRITING arc, rung W-R2g: MECHANICAL grammar checks. Content-agnostic, deterministic, dictionary-FREE. Honest scope: these are the mechanical checks an editor catches by pattern, NOT full ML/Grammarly-class grammar -- dictionary spell-check + suggestion ranking is a later sub-arc. This fills the lone honest gap in the W-EXC-1 census with a real, exact organ. Checks (out[], filled by gr_check): out[0] = doubled words -- the same word twice in a row ("the the") out[1] = a/an misuse -- "a" before a vowel, or "an" before a consonant (letter heuristic; a/e/i/o/u are vowels, not y/h) out[2] = cap-after-period -- a lowercase word right after . ! or ? returns the total error count. Pure integer, NO syscalls. Reuses nx_writecraft for char classification (DRY). license_tier: ORIGINAL module: nishi-core.write.grammar depends: nishi-core.write.craft capability: WRITE_MECHANICAL_GRAMMAR