Pin the Schema name search read gate and correct the permissions docs

docs/api/rest-api.md

@@ -23,8 +23,9 @@ Demo wiki example: [neowiki.dev/w/rest.php/specs/v0/module/-](https://neowiki.de
 
 ## Permissions
 
-Read endpoints enforce the caller's per-page `read` permission: page protection, restricted namespaces, read
-whitelists, and permission extensions all apply. When you may not read a page, its read endpoints respond as if
+The Subject, Schema, Layout, Mapping and RDF read endpoints enforce the caller's per-page `read` permission: read
+whitelists and permission extensions apply. (MediaWiki's `read` action ignores page protection and
+`$wgNamespaceProtection`, so neither restricts these endpoints.) When you may not read a page, they respond as if
 the data were absent — a `null` value, an empty list, or a `404` — rather than with a `403`. Treat a not-found
 response as "not available": it may mean the data does not exist, or that you may not read it.
 

tests/phpunit/Persistence/MediaWiki/DatabaseSchemaNameLookupTest.php

@@ -141,6 +141,19 @@ public function testUnreadableSchemaNamesAreOmitted(): void {
 		);
 	}
 
+	public function testUnreadableSchemaNamesAreOmittedFromSearchResults(): void {
+		$denyFirstMatch = static fn ( string $permission, ?PageIdentity $page = null ): bool =>
+			$page === null || $page->getDBkey() !== 'SchemaNameLookupTest21';
+
+		$names = array_map(
+			static fn ( TitleValue $title ): string => $title->getText(),
+			$this->getLookup( $this->mockRegisteredAuthority( $denyFirstMatch ) )
+				->getSchemaNamesMatching( 'SchemaNameLookupTest2', 10 )
+		);
+
+		$this->assertSame( [ 'SchemaNameLookupTest22' ], $names );
+	}
+
 	public function testGateUsesBindingAuthorizeRead(): void {
 		// probablyCan is a UI-hint check that skips the expensive ACL hook; the filter must
 		// use the binding authorizeRead with the 'read' action. Reverting fails this test.