Module stems 

Stem filename conventions, shared by the migrator, the cleanup pass and (later) the mixer. Port of the naming helpers in mix_common.py and XILP007_stem_migrator.py.

Functions

entries_index

{seq: entry} index over a parsed script’s entries.

expected_stem_basename

{seq:03d}_{section}[-{scene}]_{speaker|sfx} — the stem basename for a parsed entry, with no extension.

extract_seq

Sequence number from a stem filename. Legacy preamble stems used an n prefix for negative seqs and are still parsed.