[PR] Native-Identity Fastpath: Observation Layer (M1) + Identity-Only Hit Gate (v5) | 原生身份快路径:观测层+身份制判据(一次做完) - #5576

[PR] Native-Identity Fastpath: Observation Layer (M1) + Identity-Only Hit Gate (v5) | 原生身份快路径:观测层+身份制判据(一次做完)#5576

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