Stub tests

Drop implementation details from `instructions.append.md` #1315

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Run time

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Job	Run time
Go 1.26.x - ubuntu-24.04/amd64	1m 1s
Go 1.26.x - macOS-latest/amd64	1m 51s
Go 1.26.x - windows-2025/amd64	3m 5s
Go 1.26.x - windows-2025/386	3m 32s
Go 1.26.x - ubuntu-24.04/386	55s
	10m 24s