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docs(readme): lead with getting started, tighten diagnosis and effici… #14

Job	Run time
public tree hygiene	3s
test (go stable)	2m 27s
test (go 1.26.5)	2m 33s
integration (clickhouse + postgres)	1m 16s
lint + vuln	1m 3s
license	7s
commit messages	0s
	7m 29s