Implement the 015-add-jscpd-gate feature that adds copy-paste detection to the quality gate using jscpd with a 5% duplication threshold integrated into pnpm check

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

.jscpd.json

@@ -0,0 +1,8 @@
+{
+	"threshold": 5,
+	"minLines": 5,
+	"minTokens": 50,
+	"pattern": ["**/*.ts", "**/*.tsx"],
+	"ignore": ["node_modules", "dist", "build", "coverage", ".specify", "specs"],
+	"reporters": ["console"]
+}