kb: add gospel guitar pack (task P-01)

5 gospel progressions x 2 plays: cascading 2-5-1s, 6-2-5-1 + plagal Amen, IV-#iv°7-I
passing dim, modern sus/9th praise vamp, iii-vi back-door. Shell/sus/9th voicings, all
pitch-class-verified. Registered in kb/index.js. Validator: 9 styles / 45 progressions /
90 plays. Critic PASS.

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

src/data/kb/gospel/meta.js

@@ -0,0 +1,7 @@
+export default {
+  id: 'gospel',
+  label: 'Gospel',
+  feel: 'shuffle',
+  tempoRange: [60, 130],
+  character: 'Church harmony in motion — cascading 2–5–1 chains, the plagal "Amen", chromatic passing diminisheds, and sus/9th colour everywhere, all pulling toward a big resolution.',
+}