Hybrid polyglot testkit: Go CLI bridge + wrapper smoke tests #47

Job	Run time
spec-kit-conformance	45s
wrapper-cross-platform (macos-latest)	49s
test (1.22.x)	18s
test (stable)	25s
wrapper-cross-platform (ubuntu-latest)	27s
wrapper-cross-platform (windows-latest)	1m 23s
	4m 7s

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