- t2_2, t2_3, t2_4, t2_5: completed
- phase_2: completed (checkpoint: ddd600f4)
- phase_2_complete: true
Total migrations: 5+6+7+12 = 30 sites (spec said 32; the audit count was
later refined to 30 INTERNAL_BROAD_CATCH sites - the spec's count was
from an earlier audit run before heuristics were refined).
Refs: 6333e0e6, 345dee34, ae62a3f5, ddd600f4