docs(examples): close saas tutorial boundary

Promote examples/saas from skeleton wording to the canonical tutorial app and record the v1 release decision that local persistence plus provider-explicit recipes is the supported production boundary for CI-friendly docs.

req: examples/001

req: auth/001

req: laws/004

req: public_api/005

examples/saas/src/lib.rs

@@ -320,7 +320,7 @@ mod tests {
     }
 
     #[test]
-    fn home_page_documents_the_production_skeleton_boundaries() {
+    fn home_page_documents_the_production_app_boundaries() {
         // req: examples/001 req: auth/001 req: auth/004 req: interop/003
         let ctx = AppContext::demo();
         let html = home_page(&ctx);