Add adaptive CC probe scaling and NACK limits - #111
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Hello,
This PR introduces adaptive congestion control probe scaling, piggybacking, and NACK failsafe limits. Together, these optimizations prevent network collapse from feedback storms in many-to-many topologies (#112) where existing TFRC would normally scale poorly.
NormSetAdaptiveProbeScaling()API to enable dynamic scaling of GRTT CC probe frequencies, allowing thousands of nodes to safely participate without probe-flooding the mesh.NormCCProbeExtensionto piggyback CC probe requests directly insideNORM_DATApackets, dramatically reducing independent packet overhead.NormSetNackFailsafeLimit()API to place a hard ceiling on the number of NACKs transmitted per GRTT window, preventing feedback implosion during synchronized network-wide loss events.+nacklimitCLI flag in thenormapptesting utility to evaluate NACK capping.Happy to adjust naming conventions, the API shape, or the CC probe scaling math if you prefer a different approach.