Add weekly scheduled build and Dependabot updates for uv lockfile

The scheduled run exercises the full build without deploying (deploy
steps are push-gated), so a breaking library release shows up as a red
badge within a week instead of silently rotting. Dependabot groups
Python bumps into one weekly PR that CI proves out.

Author: tdhopper

.github/dependabot.yml

@@ -0,0 +1,13 @@
+version: 2
+updates:
+  - package-ecosystem: "uv"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      python-dependencies:
+        patterns: ["*"]
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/deploy.yml

@@ -5,6 +5,10 @@ on:
     branches: ['**']
   pull_request:
     branches: [master]
+  schedule:
+    # Weekly build-health check; deploy steps only run on push events,
+    # so this catches library breakage without touching production.
+    - cron: '0 6 * * 1'
 
 jobs:
   build-and-deploy: