kb: add R&B/neo-soul guitar pack

5 progressions (mediant circle, Stevie 6-2-5-1 with 9sus V, maj7
two-chord vamp, D'Angelo Dorian vamp, gospel Amen IV-iv-I) x 2 plays:
m9 slides, m11 colour sets, embellished Mayfield/Hendrix barres,
Dilla-feel barre wash. Comping documents pluck-and-mute, the neo-soul
slide, hammer vocabulary, Cropper 6ths, the Dilla feel. Sourced
Mayfield figures (standard-tuning adaptation flagged). Validator and
build green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/data/kb/index.js

@@ -21,6 +21,9 @@ import reggaeGuitar from './reggae/guitar.js'
 import countryMeta from './country/meta.js'
 import countryProgressions from './country/progressions.js'
 import countryGuitar from './country/guitar.js'
+import rnbMeta from './rnb/meta.js'
+import rnbProgressions from './rnb/progressions.js'
+import rnbGuitar from './rnb/guitar.js'
 
 export default {
   jazz: {
@@ -58,4 +61,9 @@ export default {
     progressions: countryProgressions,
     instruments: { guitar: countryGuitar },
   },
+  rnb: {
+    meta: rnbMeta,
+    progressions: rnbProgressions,
+    instruments: { guitar: rnbGuitar },
+  },
 }