[ECO-5181] Fix sending and receiving of reaction metadata and headers #663

Job	Run time
check-documentation	1m 19s
spec-coverage	46s
generate-matrices	46s
lint	1m 10s
SPM, `release` configuration (Xcode 16)	1m 5s
SPM (Xcode 16)	1m 41s
Xcode, macOS (Xcode 16)	2m 51s
Xcode, `release` configuration, macOS (Xcode 16)	2m 5s
Xcode, iOS (Xcode 16)	3m 33s
Xcode, `release` configuration, iOS (Xcode 16)	2m 10s
Xcode, tvOS (Xcode 16)	3m 11s
Xcode, `release` configuration, tvOS (Xcode 16)	1m 59s
Example app, macOS (Xcode 16)	1m 47s
Example app, iOS (Xcode 16)	1m 49s
Example app, tvOS (Xcode 16)	2m 27s
all-checks-completed	1s
	28m 40s

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