RIFF chunk dump proved samples carry NO semantic embedded metadata (only encoder
tags) — the Pulsar browser shows FILENAMES. So harvest the filename: leading pad
index + instrument-token lexicon → fleet family + source hint. Conservative: opaque
names (JUPI, doing_it_right, 808hc's 'HC') stay family=None → fall back to audio.
Detects kit-like folders (≥2 families by name), the 'jazz is a kit' case.
Corpus coverage: 49% folders / 31% files named, 36 kit-like folders.