- Add ~85 new chords: Celsius/Fahrenheit signs, emoji faces, gesture
emoji, symbols, nature, food/object emoji (incl. slang aliases)
- Widen chord index/count types uint8_t -> uint16_t (table now 241
entries, was nearing the 255 cap)
- Add gen_cheatsheet.py + cheatsheet.template.html: generates
cheatsheet.html from chord_unicode.c so the reference stays in sync
with the table
- Ignore /CLAUDE.md, /AGENTS.md, AGENTS/, __pycache__, and other
agents-init/editor/OS junk in .gitignore