New second marimba C engine flatterbop180 (3/4 bop) alongside fluttabap360: - run-c.mjs takes --engine <name> (default fluttabap360); build.sh loops both - bin/render-flatterbop180.mjs composer + flatterbop180.song.json score - bin/fetch-zoo.mjs sources CC0/CC-BY animal one-shots from freesound (48k mono, trimmed + peak-normalized) into samples/zoo/ with zoo.json attributions for release notes - gitignore the compiled flatterbop180 binary like its fluttabap360 sibling Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>