Hybrid polyglot testkit: Go CLI bridge + wrapper smoke tests #50

Job	Run time
wrapper-cross-platform (macos-latest)	36s
wrapper-cross-platform (windows-latest)	1m 30s
spec-kit-conformance	47s
test (stable)	25s
test (1.22.x)	19s
wrapper-cross-platform (ubuntu-latest)	42s
	4m 19s

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