Hybrid polyglot testkit: Go CLI bridge + wrapper smoke tests #43

Job	Run time
spec-kit-conformance	43s
wrapper-cross-platform (ubuntu-latest)	37s
test (stable)	24s
wrapper-cross-platform (macos-latest)	1m 3s
wrapper-cross-platform (windows-latest)	2m 5s
test (1.22.x)	13s
	5m 5s

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