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- Introduce TunnelSession that holds a single authenticated SendRequest shared across all concurrent SOCKS5 streams via Arc<Mutex<>> - Connector authenticates once on startup, then reuses the persistent tunnel for all SOCKS5 CONNECT requests - Listener /forward returns raw bytes (no HTTP parse/unparse overhead) to preserve exact byte semantics for SOCKS5 TCP proxying - Add stream counters (session-X) for logging and isolation tracking - Add 5 new tests: sequential streams, concurrent streams with isolation, stream counter increments, pre-auth rejection, and E2E concurrent SOCKS5 streams over a shared tunnel - All 117 tests pass; E2E CLI validates 5 concurrent streams share one persistent TLS connection (127.0.0.1:64216 in transcript)