ci(lint): run the skill-frame freshness gate's self-test half in CI (… #18639

Job	Run time
filter	9s
Test Core	10s
Dogfood Regression Gate	11s
Test Core (${{ matrix.shard }}/3)	-1s
Console Pin Gate	-1s
Dogfood Verify CLI	-1s
Build Core	-1s
Build Docs	-1s
Dogfood Regression Gate (${{ matrix.shard }}/3)	-1s
Temporal Conformance (live PG + MySQL)	-1s
	23s

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