data: add first hand-transcribed user corpus chord files

Three songs (electricity, hikari_no_shizuku, okazalos) covering verse/chorus/bridge sections, all tagged style: H1K0.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/raw_user/electricity-chorus.chord

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+# title: Electricity
+# key: Ab_major
+# time: 4/4
+# subdivision: 4
+# style: H1K0
+# function: chorus
+
+| Ab . . . | Eb . . . | Fm . . . | Cm . . . | Db . . . | Ab . . . | Ebsus4 . . . | Eb . . . |

data/raw_user/electricity-verse.chord

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+# title: Electricity
+# key: Ab_major
+# time: 4/4
+# subdivision: 4
+# style: H1K0
+# function: verse
+
+| Ab . . . | Eb . . . | Fm . . . | Cm . . . | Db . . . | Ab . . . | Eb . . . | . . . . |
+| Ab . . . | Db . . . | Eb . . . | Ab . . . | Fm . . . | Db . . . | Ebsus4 . . . | Eb . . . |

data/raw_user/hikari_no_shizuku-chorus.chord

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+# title: Hikari no Shizuku
+# key: G_major
+# time: 5/4
+# subdivision: 4
+# style: H1K0
+# function: chorus
+
+| Cmaj7 . . D Em7 | Am7 . Bm7 . G |

data/raw_user/okazalos-bridge.chord

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+# title: Оказалось...
+# key: G_major
+# time: 4/4
+# subdivision: 4
+# style: H1K0
+# function: bridge
+
+| NC . D D7 | G . . . | D/F# . . . | Dm/F . . . | C/E . . . | Eb . . . | D . A7/C# . | Am11 . . . | D Em7 Fdim D7/F# |
+| G . . . | Bm7/F# . . . | Fmaj7 . . . | E F Gdim E7/G# | Am7 . D9 . | Bm7 . Em . | Fmaj7 . Dm7 D7 | G7 . . . |

data/raw_user/okazalos-chorus.chord

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+# title: Оказалось...
+# key: C_major
+# time: 4/4
+# subdivision: 4
+# style: H1K0
+# function: chorus
+
+| C6 . Gsus2 . | C6 . Gm7 . | C6 . C6/G F#aug | Dm/F . E . | Am7 . Am7/E Am7b5/Eb | D7 . D D/E | Fm . Fm/C Fm/B | Faug/Bb F#aug/A Gaug . |
+| C6 . Gsus2 . | C6 . Gm7 . | C6 . C9/E . | Fsus2 . F . | Fmaj7 . F#m7b5 . | C/G . A A/C# | Dm7 . Abmaj7 Bbmaj7 | C6 . . . |

data/raw_user/okazalos-verse.chord

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+# title: Оказалось...
+# key: F_major
+# time: 4/4
+# subdivision: 4
+# style: H1K0
+# function: verse
+
+| NC . Cm7 F7 | Bbmaj7 . . . | A7 . . . | Dm7 . Dm7/F . | F/G . G . | Gm . Gm/D Gm/Db | C7 . C7/E . | F . Gm7 . | Fdim/Ab . F/A . |
+| Bb . . . | Dm/A . . . | Ddim/Ab . . . | Gm . . . | Dbmaj7 . . . | Gb6 . Gb . | Dm9 . . . | F/G . Gaug . |