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chore: drop redundant CLAUDE.md, keep AGENTS.md only #1470

Job	Run time
secrets	9s
format	39s
markdown	11s
duplication	15s
deadcode	48s
vet	1m 40s
workspace and module parity	16s
module hygiene	11s
public module graph	2m 58s
test (race + coverage)	2m 45s
smoke	1m 58s
lint	2m 46s
api reference	14s
security	2m 47s
fuzz (60s)	1s
build (${{ matrix.goos }}/${{ matrix.goarch }})	1s
	17m 39s