chore: disable dependabot

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bobbyjohnstx

.github/dependabot.yml

@@ -1,11 +1,3 @@
+# Dependabot is disabled — we manage dependency updates manually.
 version: 2
-updates:
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-  - package-ecosystem: "npm"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-    open-pull-requests-limit: 10
+updates: []