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Issue: QUIC context cannot act as both server and client

Issue: QUIC context cannot act as both server and client: a task in LegoFlow-SWE (Harbor dataset). Problem: A picoquic quic t context is currently limited to either a server role or a client role, but not both. This prevents a single QUIC endpoint from simultaneously accepting incoming connections…

The task

**Problem:** A `picoquic_quic_t` context is currently limited to either a server role or a client role, but not both. This prevents a single QUIC endpoint from simultaneously accepting incoming connections and initiating outgoing connections.

Part of Lego-X/LegoFlow-SWE.