SB Gateway 1.6.77

• Give each outgoing DoH request its own body storage. Late HTTP transport cleanup and retries can no longer read a recycled incoming DNS datagram.
• Include a deterministic regression for cancellation and early connection errors, including replayed request bodies.
• Update the server core to Xray v26.10.21 and Go 1.27.3 with maintained gateway patches and updated TLS trust roots.
• Smooth planned URLTest selection with up to three fresh full-HTTPS samples. Both the latest pair and the short median must beat the configured margin in two independent comparisons.
• Preserve a qualified pending nominee, keep current failures separate from latency smoothing, and align current Delta with the same short selection window.

Existing memory limits are preserved. Exported Reverse bridge profiles retain
their independent compatibility pin. URLTest measures HTTPS latency rather than
sustained transfer throughput.