Canonical formatter: width-aware meme output.
Composes printer (form → Doc) with render (layout @ target width).
Used by `meme format` CLI command.

Owns the canonical style — layout policy for how calls are structured.
Uses `meme-lang.form-shape/registry` as the default form-shape vocabulary;
callers can override via the `:form-shape` opts key.

Flat formatter: single-line meme output — true pass-through.
Composes printer (form → Doc) with render (layout @ infinite width).
No style opinions: no definition-form spacing, no head-line splitting.

Form-shape decomposition still runs so semantic slots like :bindings
and :clause render correctly (binding vectors, case/cond pairs); flat
layout at infinite width produces the same result regardless.