docs(docs-audit): record why CHANGELOG.md is NOT added to the drift exclusion #11007

Job	Run time
filter	8s
Dogfood Regression Gate	2s
Test Core	-1s
Check Generated Artifacts	-1s
Build Docs	-1s
Temporal Conformance (live PG + MySQL)	-1s
Build Core	-1s
Dogfood Regression Gate (${{ matrix.shard }}/2)	-1s
	4s

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