test(direction): pin SD-2778 migration via typed-path + broader-fallback cases

Two coverage gaps caught in review:

- layout-resolved/src/resolveLayout.test.ts ("preserves increasing
  first-line marker anchor for nested RTL list levels") used
  attrs.direction: 'rtl'. The pre-migration code read attrs.direction
  directly, so that fixture would have passed against the old
  implementation. Switch to directionContext.inlineDirection so the test
  only passes through the new helper-driven typed path.

- layout-bridge/test/position-hit.test.ts: switching isRtlBlock to
  getParagraphInlineDirection is strictly broader on fallback (the helper
  also picks up paragraphProperties.rightToLeft when no directionContext
  is present). Pin that case so the broadening is intentional and not a
  regression vector.

Author: caio-pizzol

packages/layout-engine/layout-bridge/test/position-hit.test.ts

@@ -61,4 +61,13 @@ describe('isRtlBlock', () => {
       ),
     ).toBe(true);
   });
+
+  // SD-2778: switching to getParagraphInlineDirection is strictly broader on
+  // fallback than the prior inline read. Specifically, the helper picks up
+  // paragraphProperties.rightToLeft when neither directionContext nor the legacy
+  // scalar field is present. Pin that case so the broader fallback is intentional.
+  it('falls back to paragraphProperties.rightToLeft when no other direction signal is present', () => {
+    expect(isRtlBlock(paragraph({ paragraphProperties: { rightToLeft: true } }))).toBe(true);
+    expect(isRtlBlock(paragraph({ paragraphProperties: { rightToLeft: false } }))).toBe(false);
+  });
 });

packages/layout-engine/layout-resolved/src/resolveLayout.test.ts

@@ -1777,7 +1777,12 @@ describe('resolveLayout', () => {
         id,
         runs: [{ kind: 'text', text: 'RTL list item' }],
         attrs: {
-          direction: 'rtl',
+          // SD-2778: use directionContext so this test only passes through the
+          // new helper-driven typed path. The pre-migration code read
+          // attrs.direction directly, so the prior `direction: 'rtl'` fixture
+          // would have passed against the old implementation too and didn't
+          // actually prove the migration.
+          directionContext: { inlineDirection: 'rtl', writingMode: 'horizontal-tb' },
           indent: { right, hanging: -24 },
           wordLayout: {
             marker: {