The original spec premise "21 .ail fixtures / 34 (tail-app …) sites"
under-counted the corpus's non-structural-recursion surface. it.2
proved the true it.3 migration set is three classes: the ~20
tail-app-marked fixtures + ~18 no-ADT-candidate counter-recursion
fixtures (deferred via it.2's no-candidate skip) + the 2 RC fixtures
it.2 joined to the transitional grandfather. it.3 removes the
tail==false grandfather AND the no-ADT-candidate skip together.
No design decision (D1-D4) changes — factual scope-widening only,
traceable to 2026-05-15-iter-it.2.md §Concerns. Not relitigating
the complete, green it.2 (feedback: spec_over_plan_patches — fix
the spec where it governs, not the plan around it).
Brummel
20181786a3