chore(config): add GRU monetary-unit manifest; bump smom-dbis-138

BTC/cBTC/cWBTC registry row for token-aggregation monetary-unit tests.
Submodule picks up token-aggregation Jest GRU-loader gating + test:ci:gru script.

Co-authored-by: Cursor <cursoragent@cursor.com>

config/gru-monetary-unit-manifest.json

@@ -0,0 +1,11 @@
+{
+  "monetaryUnits": [
+    {
+      "code": "BTC",
+      "canonicalSymbol": "cBTC",
+      "wrappedSymbol": "cWBTC",
+      "mappingKey": "Compliant_BTC_cW",
+      "decimals": 8
+    }
+  ]
+}