76df890074
SpellChecker with ~300 common English words + programming terms. Word tokenizer handles apostrophes, digits, underscores. Editor integration: toggle_spell_check(), find_next_misspelled(). MC uses libaspell; TLC embeds dictionary for zero external deps. 17 new tests: check_word, check_line, case insensitive, editor integration (toggle, find_next, disabled, correct text).