Track the existing (untracked) stress matrix, extend the signal-size axis
into the multi-fragment regime now that the UDPSClient reassembly cap is
1 MiB, and wire stress results into the E2E PDF report via an opt-in
--stress flag (table + per-axis scaling curves + regression vs prior run).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Martino Ferrari