321cf5cc81d703c02cd32e628b755a3dc4499063  [list-marker] AX: The list marker is missing from the stitched text of a list item with block content

Classified as not security-relevant.
Triage note: AccessibilityNodeObject::stitchGroups adds a stitchableExcludedMarker lookup so an outside list marker is placed at the start of its line's group. Accessibility-tree layout correctness tied to the excluded-marker work, no security bug.
This commit was flagged by the signal scorer and reviewed by AI (not a human). It is listed only so the triage is auditable; there is no root-cause analysis because this is not a vulnerability fix.

Structural signals: smartptr_member_added (+6.47), null_guard (+1.2), surgical (+1.3)