chore: add dependabot config content (file was committed empty)

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

Author: jp-agenta

.github/dependabot.yml

@@ -0,0 +1,9 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 0
+    exclude-paths:
+      - "docs/**"