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## Why Stopping proxy listeners could leave accepted connections and half-closed tunnels alive after their owning thread was unloaded. ## What changed Tie HTTP and SOCKS5 connection work, including HTTP CONNECT upgrades, to the lifetime of the proxy listeners. Cancel connections across the main and environment proxies when the handle is dropped, shutdown is requested, or `wait()` is canceled. Explicit shutdown waits for connection cleanup. ## Testing Add live TCP regression tests for HTTP keep-alive connections and open or half-closed HTTP CONNECT and SOCKS5 tunnels across shutdown, handle drop, and canceled waits. Verify that half-closed tunnels still carry return traffic while the proxy is running, and that repeated thread creation and unloading closes managed proxy tunnels. GitOrigin-RevId: b523f3b08d73e9ae368f6932952cc930c7b038c9