Apple

Harden attention sink export: start_pos, mask mode, and buffer initia… #20123

Job	Run time
set-version	10s
build-benchmark-app / macos-job	1h 18m 19s
build-demo-ios / macos-job	43m 4s
build-frameworks-ios / macos-job	58m 30s
upload-demo-ios	44s
test-demo-ios / mobile-job (ios)	20m 29s
upload-frameworks-ios	53s
	3h 22m 9s

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