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

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

pkg/model/constants.go

@@ -33,4 +33,4 @@ const (
 	RuntimeHintUVX    = "uvx"
 	RuntimeHintDocker = "docker"
 	RuntimeHintDNX    = "dnx"
-)
+)