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Address review findings: - Only the live subscriber may set the mode, so a mode set by a client that never subscribes cannot persist past its session - With a subscriber attached, the mode alone decides whether the tap is served; tap_needs_port() bypasses it only while the port is unheld, and write_from_tap() is gated the same way, so RAW is inert by code - The explicit UNSUBSCRIBE path keeps the loop alive for a tap that still needs the port, mirroring the disconnect path in loop() - Mode values from the wire are validated; unknown values are refused with INVALID_ARGUMENT instead of stored and acknowledged OK - Add a test variant that defines USE_SERIAL_PROXY_TAP so the tap code paths compile in a real build