This updates the docs-main latest merge anchor inside the REV004 final mainline
summary so the document remains self-consistent after its own merge.
Constraint: The final summary must reference the current docs mainline state, not the pre-summary merge anchor
Rejected: Leave the older docs merge SHA in place | would make the summary internally stale immediately after merge
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Refresh top-level summary anchors whenever the summary itself is merged into main
Tested: Cross-checked against origin/main latest merge ab4eec0...
Not-tested: No document export/render pipeline executed for this one-line metadata refresh
tangweijie
6cb590aa13