Skip links to undocumented resources in generated API docs

Check isUndocumented before generating resource links in endpoint
responses. Prevents broken links to pages that don't exist because
the resource namespace is undocumented (e.g., unstable_partner).

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

Author: louis-pre

codegen/lib/layout/api-endpoint.ts

@@ -173,7 +173,7 @@ export function setEndpointLayoutContext(
     )
 
     let responsePath = null
-    if (responseResource != null) {
+    if (responseResource != null && !responseResource.isUndocumented) {
       responsePath = path
         .relative(endpoint.path, responseResource.routePath)
         .replace('..', '.') // gitbook expects first level to be .
@@ -196,7 +196,7 @@ export function setEndpointLayoutContext(
             (r) => r.resourceType === batchResource.resourceType,
           )
           let batchResponsePath = null
-          if (batchResourceDef != null) {
+          if (batchResourceDef != null && !batchResourceDef.isUndocumented) {
             batchResponsePath = path
               .relative(endpoint.path, batchResourceDef.routePath)
               .replace('..', '.')