docs: clarify release deployment process and enable manual deploy trigger

- Add workflow_dispatch to deploy.yml for manual deployment triggers
- Document that releases don't auto-deploy to production
- Add instructions for deploying releases to production
- Add verification steps for deployment

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

.github/workflows/deploy.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - main
+  workflow_dispatch:
 
 permissions:
   contents: read