Hybrid polyglot testkit: Go CLI bridge + wrapper smoke tests (#6) #51

Job	Run time
test (1.22.x)	18s
wrapper-cross-platform (ubuntu-latest)	43s
wrapper-cross-platform (macos-latest)	52s
test (stable)	22s
spec-kit-conformance	47s
wrapper-cross-platform (windows-latest)	1m 27s
	4m 29s

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