Brummel
c657e74f9c
Form-B prose renders loop binders as bare `name = init;` statements
inside the `loop { … }` body, which reads as C/Rust re-init-every-
iteration semantics — a lie about a body the projection exists to
let the reader trust. Redesign: parenthesised init-list on the
keyword, `loop(acc = 0, i = 1) { … }`, positionally isomorphic to
`recur(...)`. Projection-only; loop/recur AST, Form A, JSON-AST,
typecheck, codegen, and the Form-A↔JSON round-trip invariant are
untouched. Step-7.5 grounding-check PASS. Roadmap entry opened P0
in-flight.