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Drop implementation details from `instructions.append.md` #522

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Run time

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Job	Run time
Go 1.26.x - ubuntu-24.04/386	23s
Go 1.26.x - ubuntu-24.04/amd64	19s
Go 1.26.x - windows-2025/386	1m 3s
Go 1.26.x - windows-2025/amd64	58s
Go 1.26.x - macOS-latest/amd64	28s
	3m 11s