chore: restack project history on current #264 head

[seonghobae]

Internal stack-maintenance PR. Merges the exact current feat/event-lineage-node-keeps-gnb-focus-v2170 head into feat/project-history-timeline-v2184-r3 before rerunning the project-history RED→GREEN workflow. No product scope is added here; the merge preserves the #264 parent as an ancestor and does not authorize #285 for integration.

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