A colliding transclusionSource id is deliberately NOT reassigned (its id is a
cross-reference key), while a missing id is still filled. Add coverage for both:
two sources sharing an id keep it (red if the NO_REASSIGN guard is removed), and
a source with no id gets a fresh one.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
editor-pm-7: addUniqueIdsToDoc only FILLED missing ids and never deduplicated
existing ones, so a copy/paste or bulk-JSON duplicate that kept its attrs.id
produced two nodes sharing an id. MCP addressed edits (patch_node /
delete_node "before/after id") then hit the wrong node or both.
Walk the configured-type nodes in document order: the first occurrence of an
id keeps it (stable anchor), later duplicates are reassigned a fresh id.
transclusionSource ids are cross-reference keys (references resolve a source by
this id), so they are only filled-when-missing, never reassigned, to avoid
orphaning their references.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
