feat: add top-level CompareAndSwap and CompareAndDelete (#14) #12

Job	Run time
Security scan	35s
No local paths or replace directives	3s
Makefile targets documented	4s
Apache 2.0 header on every Go file	3s
Build darwin/arm64	24s
Lint	1m 24s
No AI attribution	4s
Test (ubuntu-latest)	41s
GoReleaser config check	16s
Build linux/amd64	16s
Test (macos-latest)	30s
Build windows/amd64	13s
	4m 33s

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