fix(ios): make custom-action reads atomically single-flight #6118

Job	Run time
Swift Runner Unit Compile	1m 38s
Replay-Compat Provenance	32s
Layering Guard	29s
Maestro Conformance Oracle	22s
Static Checks	7s
Affected-check Selector	20s
Fallow Code Quality	37s
Integration Tests	1m 26s
Web Platform Smoke	41s
Lint & Format	23s
Typecheck	36s
Released-Surface Compatibility	27s
Packaged CLI Node 22.12	39s
FreeRange	3m 56s
Coverage	5m 19s
	17m 32s

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