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chore: reorganize repo — move docs to docs/, clean up root, remove AG… #450

Job	Run time
module hygiene	20s
duplication	12s
secrets	17s
markdown	11s
deadcode	30s
vet	31s
format	23s
lint	-1s
test (race + coverage)	-1s
smoke	-1s
security	-1s
build (${{ matrix.goos }}/${{ matrix.goarch }})	0s
	2m 20s