- waveform.py: render_multiband_waveform() — N rows of ASCII bars, each row
labeled with its band-start time. Makes it easy to find timestamps in
long audio by counting row + column.
- cli.py: new 'multiband' / 'mb' subcommand
- Fixed: multiband band alignment was drifting (off-by-one in samples)
- tests: 1 new multiband smoke test; 62 total all passing
sami7777
6b12130bbd