Parallelism + Reverse Mode

[Mansi-SLU]

Map -P → multiple QUIC streams

Aggregate total bytes

Implement reverse mode (-R)

Ensure correct sender/receiver switching

Maintain proper cleanup

[Mansi-SLU]

Parallel stream accounting is incorrect. During -P tests, the interval output shows activity on multiple streams, but the final summary reports data only for one stream.
Reverse mode statistics are inaccurate. The sender and receiver totals do not match, indicating that byte counters are not being updated correctly.