Brummel
4c2a3c5d08
Iter 0 of the form-a-default-authoring milestone. One file rendered (examples/prelude.ail.json -> examples/prelude.ail via `ail render`), zero source-code edits, zero test-infra changes. The migration mechanism is validated on the hardest single file in the corpus (prelude exercises every language feature: classes, superclasses, polymorphic free fns, IO effects, ctor patterns, loader auto-injection). The two auto-discovering roundtrip tests in round_trip.rs pick up the new .ail via read_dir without test edits; both must pass for the iter to close. Task 1: render + verify both roundtrip tests green + workspace sanity check (5 steps). Task 2: per-iter journal + INDEX append (2 steps). prelude.ail.json retained per spec §A2 — this is the singular dual-form iter; iter 1 deletes it with the bulk test-infra refactor.