Quiet gap logging, interpret plugin workarounds, and defer entry-target checks

[rpatters1]

Logging

The gap report is where gaps go; a client that does not want them is not owed a log full of them.

• MNX no longer logs each unclassified smart shape or unplaceable gap anchor. classifier-design skill updated to match.
• Lyric hyphens and word extensions classify as a new smartshape::Suppress, which vanishes from every shape path without export, gap, or log (the lyric that owns them exports or reports them). MusicXML was logging 8,000 of these per run on a large score.
• A shape that fails calcIsValid keeps its real shapeType in the classification (it used to default to SlurDown), and the MusicXML log says invalid rather than unclassified for it.
• A text expression whose text block names no text classifies as Suppress. Human Playback authors those for MIDI data; one score carried 1,740 warnings about them.

musxdom pin → aff4981c (openmusx/musxdom#199, #200)

musxdom now interprets the Beam Over Barlines plugin's default singleton-beam form, merges the tie flags the plugin splits across the two entries, and follows an entry-attached endpoint's entry when its recorded measure went stale. Denigma reads tie flags through NoteInfoPtr::calcHasTieStart/calcHasTieEnd (MNX, MusicXML, ottavas) and endpoint staves/measures through EndPoint::calcStaff/calcMeasure — except at the four assignment-dispatch sites, which stay on the recorded measure because that is where Finale keeps the assignment (each carries a comment). mnxdom pin (ee14988b) confirmed current.

MNX safety nets

• A zero-length tuplet the interpreted iterator does not resolve is omitted with its entries instead of written with "multiple": 0, which the schema rejects. Beams, ties and slurs skip the omitted entries. Recorded in design-decisions.md. Since the pin advance this no longer fires on the score that motivated it.
• Ties and slurs written against an entry are deferred and checked in finalizeEntryTargets once every entry has been exported: a tie whose target is not in the document becomes lv, a slur whose end is not is removed and reported as a gap. A cue-discarded measure was leaving a tie pointing at a note that did not exist.

Verification

• 496/496 tests; check_format.py clean.
• A 2,375-measure opera score: MNX export now passes schema and semantic validation (previously failed schema on 21 tuplets); verbose log 2,776 → 1,018 lines. MusicXML verbose log 8,228 → 231 lines, and 18 previously-dropped slurs export.

No fixture exercises the zero-length-tuplet fallback, a cue-discarded tie target, or a stale endpoint; those paths are verified only against that score.

🤖 Generated with Claude Code