Proposes renaming the three overlapping ARCHITECTURE.md files into
topic-named docs (top-level → DESIGN.md, docs/ARCHITECTURE.md →
docs/CRYPTO.md), moving FORMATS.md into docs/, and adding scope
headers + "Next:" footers to every tour doc so the reading order is
canonical: README → DESIGN → CRYPTO → FORMATS → SECURITY →
per-crate ARCHITECTURE → extension/ARCHITECTURE.
Direct response to the drift audit run earlier today (the audit's
content fixes already landed in 210232d, cf7478d, fa659eb). This
spec attacks the structural causes: name collisions, no scope
boundaries, no reading-order signposts, root/docs/ asymmetry.
Migration is mechanical — 5 sequential commits, no content rewrites:
rename, headers+footers, link-fixes, CLAUDE.md update, verification.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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