Add motif/stem_note display and offset note hierarchy

- parseAstLog: abort on depth jump >1 or missing slot (depth>0)
- buildStemNote: full clause tree (notes/pauses/stacks), editable fields
- buildClause: replaces buildCluster; filters nested clause.chain silently
- buildMotif: builds from voice.motif; sets isStatic
- buildOffset: uses buildStemNote; drops old clusters/chains arrays
- buildVoice: motifs are now objects, not label strings
- PaneSubObjects: static motifs before offsets; motif/offset→stem_note drill-down
- PaneFO: motif + stem_note FO cases; unknownProps display helper
- PaneCP: motif + stem_note shortView cases
- test-parser.mjs: 21 new synthetic tests for motif/clause/stack/guards

test-parser.mjs

@@ -429,6 +429,101 @@ ok('existing composer not duplicated', (noTitlePatched.match(/^composer:/mg) ??
 const nullInfoPatched = patchScore(META_SCORE, [], [], null);
 ok('null info leaves metadata unchanged', nullInfoPatched.includes('title: Old Title'));
 
+// ── Motif parsing ─────────────────────────────────────────────────────────
+section('Motif parsing — dynamic motif');
+const DYN_MOTIF = `00 bar '001P1L1M1'
+01 bar.voice 'pi'
+02 voice.motif label='oct'
+03 motif.stem_note pitch=0
+04 chain.clause 0 repeat=1
+05 clause.note letter='o' shift=0 length=1 netlength=1
+05 clause.note letter='o' shift=12 netlength=1 length=1
+`;
+const dynBar = buildModel(parseAstLog(DYN_MOTIF)).bars[0];
+const dynVoice = dynBar.voices['pi'];
+ok('motif is object', typeof dynVoice.motifs[0] === 'object');
+ok('motif label', dynVoice.motifs[0].label === 'oct');
+ok('motif pitch=0', dynVoice.motifs[0].stemNotes[0].pitch === 0);
+ok('dynamic motif isStatic=false', dynVoice.motifs[0].isStatic === false);
+ok('dynamic motif has 1 clause', dynVoice.motifs[0].stemNotes[0].clauses.length === 1);
+ok('clause has 2 notes', dynVoice.motifs[0].stemNotes[0].clauses[0].notes.length === 2);
+
+section('Motif parsing — static motif');
+const STAT_MOTIF = `00 bar '001P1L1M1'
+01 bar.voice 'pi'
+02 voice.motif label='cadence'
+03 motif.stem_note pitch='C4'
+04 chain.clause 0
+05 clause.note letter='o' shift=0 length=1 netlength=1
+`;
+const statVoice = buildModel(parseAstLog(STAT_MOTIF)).bars[0].voices['pi'];
+ok('static motif isStatic=true', statVoice.motifs[0].isStatic === true);
+ok('static motif pitch string', statVoice.motifs[0].stemNotes[0].pitch === 'C4');
+
+section('Motif parsing — pause and stack in clause');
+const PS_FIXTURE = `00 bar '001P1L1M1'
+01 bar.voice 'pi'
+02 voice.offset tick=0
+03 offset.stem_note pitch='C4'
+04 chain.clause 0
+05 clause.note letter='o' shift=0 length=1 netlength=1
+05 clause.pause length=1
+04 chain.clause 1
+05 clause.stack length=2 netlength=2
+06 stack.note letter='o' shift=0
+06 stack.note letter='e' shift=0
+`;
+const psVoice = buildModel(parseAstLog(PS_FIXTURE)).bars[0].voices['pi'];
+const psSn = psVoice.offsets[0].stemNotes[0];
+ok('two clauses', psSn.clauses.length === 2);
+ok('first clause has 1 note + 1 pause', psSn.clauses[0].notes.length === 1 && psSn.clauses[0].pauses.length === 1);
+ok('second clause has 1 stack', psSn.clauses[1].stacks.length === 1);
+ok('stack has 2 notes', psSn.clauses[1].stacks[0].notes.length === 2);
+
+section('Motif parsing — nested chain ignored gracefully');
+const NC_FIXTURE = `00 bar '001P1L1M1'
+01 bar.voice 'pi'
+02 voice.offset tick=0
+03 offset.stem_note pitch='C4'
+04 chain.clause 0
+05 clause.note letter='o' shift=0 length=1 netlength=1
+05 clause.chain length=2
+06 chain.clause 0
+07 clause.stack length=1 netlength=1
+08 stack.note letter='o' shift=0
+`;
+const ncSn = buildModel(parseAstLog(NC_FIXTURE)).bars[0].voices['pi'].offsets[0].stemNotes[0];
+ok('nested chain: only 1 top-level clause', ncSn.clauses.length === 1);
+ok('nested chain: only direct note counted', ncSn.clauses[0].notes.length === 1);
+ok('nested chain: no stacks leak from nested chain', ncSn.clauses[0].stacks.length === 0);
+
+section('Depth-jump guard (abort)');
+const DJ_FIXTURE = `00 bar '001P1L1M1'
+01 bar.voice 'pi'
+02 voice.motif label='oct'
+03 motif.stem_note pitch='C4'
+06 chain.clause 0
+`;
+let djThrew = false;
+try { parseAstLog(DJ_FIXTURE); } catch (e) { djThrew = true; }
+ok('depth jump throws', djThrew);
+
+section('No-slot guard (abort)');
+const NS_FIXTURE = `00 bar '001P1L1M1'
+01 voice
+`;
+let nsThrew = false;
+try { parseAstLog(NS_FIXTURE); } catch (e) { nsThrew = true; }
+ok('missing slot throws', nsThrew);
+
+section('Full fixture integration');
+ok('fixture parses without error (checked above)', raw && raw.slot === 'root');
+ok('fixture has 432 bars', model.bars.length === 432);
+const voicesWithMotifs = model.bars.flatMap(b => Object.values(b.voices)).filter(v => v.motifs.length > 0);
+ok('fixture voices have motif objects', voicesWithMotifs.every(v => v.motifs.every(m => typeof m === 'object' && 'label' in m)));
+const offsetsWithStemNotes = model.bars.flatMap(b => Object.values(b.voices)).flatMap(v => v.offsets).filter(o => o.stemNotes.length > 0);
+ok('fixture offsets have stem note objects', offsetsWithStemNotes.every(o => o.stemNotes.every(sn => 'pitch' in sn && 'clauses' in sn)));
+
 // ── Summary ────────────────────────────────────────────────────────────────
 console.log(`\n══ ${pass} passed, ${fail} failed ══\n`);
 process.exit(fail > 0 ? 1 : 0);