refactor: extract dev.hatk lexicons from cli.ts to JSON files
Move all 14 inlined dev.hatk.* lexicon definitions from cli.ts into
src/lexicons/dev/hatk/*.json. The hatk new command now copies them
with cpSync instead of writing each one inline. Build step copies
lexicons to dist/ alongside templates.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>