SimpleChat2 — UDP P2P + Broadcast (Qt6) mkdir -p build && cd build cmake .. cmake --build . -j ctest --output-on-failure ./scripts/run_many.sh 3

• QUdpSocket transport (chat + discovery)
• JSON-on-the-wire (type, origin, seq, dest, text, ackOf, vc)
• ACK + resend timers + bounded retries
• Vector clocks + anti-entropy sync
• Unit tests (message roundtrip, vector clock diff)