Phrase mode: ABC parser (subagent), library content, renderer, PhraseTrainer component

src/exercises/library/broken-chord-study.abc

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+% Original technical exercise: broken C-G-Am-F chords as a single line.
+% Written for this project, 2026, CC0.
+X:6
+T:Broken Chord Study
+C:Original exercise (project contributor)
+Z:Project contributor, 2026 (CC0)
+M:4/4
+L:1/4
+Q:1/4=80
+K:C
+C E G E | C E G c | G, B, D B, | G, B, D G | A, C E C | A, C E A | F, A, C A, | F, A, C F |]

src/exercises/library/dotted-rhythm-study.abc

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+% Original technical exercise: dotted quarter / eighth patterns.
+% Written for this project, 2026, CC0.
+X:5
+T:Dotted Rhythm Study
+C:Original exercise (project contributor)
+Z:Project contributor, 2026 (CC0)
+M:4/4
+L:1/4
+Q:1/4=70
+K:C
+C3/2 E/2 E F | G3/2 E/2 C2 | D3/2 E/2 F G | E3/2 D/2 C2 | C3/2 E/2 E F | G3/2 E/2 G2 | A3/2 G/2 F E | D3/2 C/2 C2 |]

src/exercises/library/e-minor-study.abc

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+% Original technical exercise (not attributed to any historical composer).
+% Written for this project, 2026, CC0. E minor + D major arpeggios.
+X:4
+T:E Minor Study
+C:Original exercise (project contributor)
+Z:Project contributor, 2026 (CC0)
+M:4/4
+L:1/4
+Q:1/4=80
+K:Em
+E, G, B, E | G B E2 | E, G, B, E | G B E2 | D F A D | F A D2 | E, G, B, E | E, B, E2 |]

src/exercises/library/first-position-study.abc

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+% Original technical exercise (not attributed to any historical composer).
+% Written for this project, 2026, CC0. G major, first-position friendly.
+X:3
+T:First Position Study
+C:Original exercise (project contributor)
+Z:Project contributor, 2026 (CC0)
+M:4/4
+L:1/4
+Q:1/4=80
+K:G
+G A B D | D B A G | E G A B | A G G2 | D E G A | B A G E | D E G A | G D G2 |]

src/exercises/library/ode-to-joy.abc

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+% Ode to Joy — main theme of Beethoven's Symphony No. 9 (1824).
+% Composer died 1827; the work itself is public domain worldwide.
+% Transcription: project contributor, 2026 (CC0). Single-voice adaptation:
+% only the lead melody line; the accompanying harmonies are omitted.
+% Pitch convention: concert pitch.
+X:1
+T:Ode to Joy (Theme)
+C:Ludwig van Beethoven (1770-1827)
+S:Symphony No. 9 in D minor, Op. 125 (1824), fourth movement main theme
+Z:Project contributor, 2026 (CC0 transcription); adaptation: melody line only
+M:4/4
+L:1/4
+Q:1/4=100
+K:C
+E E F G | G F E D | C C D E | E3/2 D/2 D2 | E E F G | G F E D | C C D E | D3/2 C/2 C2 |]

src/exercises/library/twinkle.abc

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+% Ah! vous dirai-je, maman — traditional French melody (published 1761).
+% Traditional tune: public domain. Transcription: project contributor, 2026 (CC0).
+% Pitch convention: concert pitch.
+X:2
+T:Ah! vous dirai-je, maman (Twinkle, Twinkle)
+C:Traditional (French melody, published 1761)
+S:Common version of the tune; no known composer
+Z:Project contributor, 2026 (CC0 transcription)
+M:4/4
+L:1/4
+Q:1/4=100
+K:C
+C C G G | A A G2 | F F E E | D D C2 | G G F F | E E D2 | G G F F | E E D2 | C C G G | A A G2 | F F E E | D D C2 |]