ci: validate OpenSpec changes strictly #1

Job	Run time
strict / kimi-unified-events	11s
strict / kimi-branch-parity	9s
strict / kimi-process-hardening	9s
strict / kimi-typed-protocol	9s
strict / kimi-acp-lifecycle-hardening	11s
strict / kimi-server-websocket	10s
strict / kimi-runtime-foundation	10s
strict / kimi-observability	8s
	1m 17s

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