4-phase design:
A. Port allocation pattern detection (sequential vs random)
B. Sequential port prediction (~80% success, <2s)
C. Birthday attack for random NATs (98% success, ~10s)
D. Hybrid waterfall with background relay-to-direct upgrade
Taskmaster tasks #84-87 added.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
