docs: declarative register across docs/, plus a style skill and a checker #1121

Job	Run time
build + unit tests (linux x86_64, self-host)	11m 21s
toolchain: musl + llvm	8m 48s
integration: mcpp builds & runs xlings	6m 8s
toolchain: gcc (cold self-host)	8m 34s
	34m 51s

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