The verbatim/offset-projection splitter mangled real prompts: long shortcut
expansions desynced the raw<->expanded offset map (empty anchor, qcut+cut
lumped), the hard-coded generic 'scene N' pattern split on incidental text
('scene 2' inside an expansion), and re-scanning expansions re-triggered on
words like the 'cut' inside 'Scene cut.' — 4 phantom chunks instead of 2.
split_scenes now walks _expand_with_map's ordered pieces ONCE: a boundary is
created only by a real transition trigger (a shortcut whose trigger word is in
the transition DB, or a literal typed trigger); expansion CONTENT is never
re-scanned; the generic scene-N pattern is dropped. Each keyed shortcut adds
its key to the current scene; the leading run is the anchor (keys fold into
all). Returns raw + expanded text + keys + effect per scene.
For the reported prompt this yields exactly 2 scenes: [keyA,keyB] and [cs],
with 'scene 2'/'Scene cut.' no longer splitting. Tests updated to use real
triggers + a regression test for the expansion-trap. 21 + 140 pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
