generate_period() now accepts n_bars=N to stop after exactly N complete
bars. bars_completed is seeded from the prefix length so --bars counts
the full output, not just the generated tail.
scripts/generate.py exposes this as --bars (default: None = model decides).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
_encode_prefix now handles hold ('.') and no-chord ('NC') tokens
alongside chord symbols, and returns (ids, n_positions) so that
pos_in_bar is tracked correctly regardless of token type.
Fixes ChordParseError when dots were passed in --prefix.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
H1K0