fix: bound retained rich text content

tests/content-model.test.ts

@@ -14,6 +14,7 @@ import {
   type OneNoteContentBlock,
   type OneNoteTextBlock,
 } from '../src/onenote/index.js';
+import type { ParserDiagnostic } from '../src/onenote/model/diagnostics.js';
 import { parseContentObjects } from '../src/onenote/one/content.js';
 import { JCID, PROPERTY } from '../src/onenote/one/constants.js';
 import type {
@@ -207,6 +208,47 @@ describe('OneNote rich-content model', () => {
       .reduce((total, stroke) => total + stroke.points.length, 0);
     expect(parsedPoints).toBeLessThanOrEqual(100);
   });
+
+  it('bounds retained rich text across content blocks', () => {
+    const guid = '{33333333-3333-3333-3333-333333333333}';
+    const firstId = id(guid, 1);
+    const secondId = id(guid, 2);
+    const richTextObject = (objectId: ExGuid, text: string) =>
+      object(
+        objectId,
+        JCID.RichTextNode,
+        props(
+          bytesEntry(PROPERTY.RichEditTextUnicode, Buffer.from(text, 'utf16le'))
+        ),
+        guid
+      );
+    const objects = [
+      richTextObject(firstId, 'first'),
+      richTextObject(secondId, 'second'),
+    ];
+    const diagnostics: ParserDiagnostic[] = [];
+    const blocks = parseContentObjects([firstId, secondId], {
+      space: {
+        id: id(guid, 0),
+        roots: new Map(),
+        objects: new Map(
+          objects.map((value) => [exGuidKey(value.id), value] as const)
+        ),
+      },
+      limits: { ...DEFAULT_ONENOTE_PARSER_LIMITS, maxExtractedTextChars: 8 },
+      diagnostics,
+      resources: new Map(),
+    });
+
+    expect(blocks).toHaveLength(1);
+    expect(blocks[0]).toMatchObject({ kind: 'text', text: 'first' });
+    expect(diagnostics).toContainEqual(
+      expect.objectContaining({
+        code: 'CONTENT_PARSE_FAILED',
+        message: expect.stringContaining('Rich-text character count exceeds 8'),
+      })
+    );
+  });
 });
 
 function parseSyntheticLink(href: string): OneNoteTextBlock {