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- HardwareGateGuardTests: only StringWriteGateTests may name a write path in HardwareGate/; the allow-list is exactly the two Z-35162 (10.209.70.160) STRING tags; the opt-in, the (host, tag) check and the AB_DIFF_ENDPOINT refusal are present. Proven red by a WriteAsync mutation. - StringWriteGateTests: allow-list entries are (host, tag); any other endpoint is refused; skips while AB_DIFF_ENDPOINT is set, like IntegrationWriteGate. - AbCip.md #566: the close happened somewhere in the 16-60 s window; RST vs FIN not captured. Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe