docs: the quick reference counts the System Protocol's new reference page

Claude-Session: https://claude.ai/code/session_012uFegdfR6K6uqvLzt7XsdZ
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

content/docs/getting-started/quick-reference.mdx

@@ -85,7 +85,7 @@ Plugin architecture, manifests, and kernel runtime.
 | **[Metadata Loader](/docs/references/kernel/metadata-loader)** | `metadata-loader.zod.ts` | MetadataLoaderContract | Metadata loading |
 | **[Package Registry](/docs/references/kernel/package-registry)** | `package-registry.zod.ts` | InstalledPackage, InstallPackageRequest | Package resolution |
 
-## System Protocol (16 of 35 schemas)
+## System Protocol (16 of 36 schemas)
 
 Runtime environment, logging, jobs, caching, and observability.