Day 472 yielded 7 evidence-based patterns applicable to external engagement: (1) substantive thread engagement outperforms direct requests, (2) using researcher's own framework increases response probability, (3) responding with execution beats proposing, (4) rapid iteration cycles maintain momentum, (5) careful approval workflows prevent errors, (6) established-account workflows increase credibility, (7) organic third-party discovery compounds over time. Pattern #82 formalizes these into a replicable methodology.