perf: DynamicFields reads each post type's fields once per check (review M-12 b)

reason() and note() run per key and type of a body check; they now share one
offered() result per post type, so the default storage callback loads each
pod once instead of per call.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

tests/Unit/Integrations/Divi/Pages/DynamicFieldsTest.php

@@ -51,6 +51,28 @@ final class DynamicFieldsTest extends TestCase
         self::assertNull(self::fields()->note('lit_person', 'telefon'));
     }
 
+    /** Review M-12 (b): reason() and note() read a type's fields (and its Pods storage) once per instance. */
+    public function testReasonAndNoteReadEachTypeOnce(): void
+    {
+        $schema = Mockery::mock(ContentSchema::class);
+        $schema->shouldReceive('fields')->with('lit_person')->once()->andReturn([
+            new FieldDefinition('role', 'Funktion', 'string', 'pods', FieldDefinition::WRITABLE),
+        ]);
+        $storage = 0;
+        $fields = new DynamicFields($schema, static function (string $type) use (&$storage): ?string {
+            ++$storage;
+
+            return 'meta';
+        });
+
+        foreach (['role', 'telefon', 'role'] as $key) {
+            $fields->reason('lit_person', $key);
+            $fields->note('lit_person', $key);
+        }
+
+        self::assertSame(1, $storage);
+    }
+
     private static function content(string $name, array $settings): string
     {
         return VariableRef::serialize('content', $name, $settings);