kb: add blues guitar pack

5 forms (standard/quick-change 12-bar, 8-bar, minor blues, turnaround
cycle) x 2 plays each: barre shuffle, Texas 9th stabs, Chicago tritone
shells, minor m7 + 7#9 climax. 4 named comping patterns, improv rules,
2 sourced licks. Validator and build green.

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

src/data/kb/index.js

@@ -3,6 +3,9 @@
 import jazzMeta from './jazz/meta.js'
 import jazzProgressions from './jazz/progressions.js'
 import jazzGuitar from './jazz/guitar.js'
+import bluesMeta from './blues/meta.js'
+import bluesProgressions from './blues/progressions.js'
+import bluesGuitar from './blues/guitar.js'
 
 export default {
   jazz: {
@@ -10,4 +13,9 @@ export default {
     progressions: jazzProgressions,
     instruments: { guitar: jazzGuitar },
   },
+  blues: {
+    meta: bluesMeta,
+    progressions: bluesProgressions,
+    instruments: { guitar: bluesGuitar },
+  },
 }