catalog: kern lyric fix (+264 rows, NIFC text now readable)

catalog: stanza-3 derivation, gabc header fix (+890 lyric rows)

catalog: hold Deutschlandlied stanza 1 + Ein Heller und ein Batzen (maintainer)

catalog: lyric incipits inline + full-text lyrics shard (27,650 rows)

catalog: drop sha256 from score items (score gz 3.7->2.0 MB)

catalog: slim items + gzipped twins (score 36.5->3.7 MB)

catalog: definitive content scan (21 held)

catalog: LilyPond relative-reference fix; 0 impossible pitches

catalog: LilyPond mid-bar voice-split fix

catalog: duration + LilyPond fixes; 99% of scores indexed

catalog: LilyPond note-language fixes (+4865 notes recovered)

catalog: hold two Mammy-stereotype songs (18 held)

catalog: final content holds (13 held)

catalog: minstrel cluster held (12 held total)

catalog: content holds applied (7 held, 8 exempt)

catalog: musical features (key/metre/ambitus/incipit) on 99% of scores

catalog: +160 Commons PD MIDI

catalog: 38,521 items (CPDL 2,546; 29 defective rows purged)

fix: 3,352 PDMX rows were format=musicxml with .mxl payloads (import failed)

catalog: +2,265 CPDL scores (37,586 items)

catalog: +9 Shortcircuit XT CC0 instruments, +31 jukebox scores

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reverify: commons German folk 846->836 (axis-2 death-checked)

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catalog