# CanonicalDocument

Medium-agnostic representation of a document with `Block`s, `SourceSpan`s,
and provenance.

Canonical source:
[docs/superpowers/specs/2026-04-27-kebab-final-form-design.md](../superpowers/specs/2026-04-27-kebab-final-form-design.md), §3.4 + §3.7a.