perf(pm): memoise the source maskers dispatch-gates re-runs per famil… #29078

Job	Run time
filter	2s
Test Core	14s
Dogfood Regression Gate	16s
Dogfood Verify CLI	1s
Temporal Conformance (live PG + MySQL)	1s
Build Core	1s
Test Core (${{ matrix.shard }}/6)	1s
Dogfood Regression Gate (${{ matrix.shard }}/3)	1s
Build Docs	1s
Console Pin Gate	1s
	39s

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