Move docs/architecture/overview.md to ARCHITECTURE.md at the repo root —
it is the primary cross-codebase architecture doc (four-codebase diagram,
inter-codebase contracts, secrets map, build matrix, test strategy, where-to-look
table) and belongs at the root alongside STATUS.md, ROADMAP.md, etc.
Update relative paths inside the file (../../crates/ → crates/, etc.).
Update CHANGELOG.md's one active reference to the old path.
Add a "Living docs — update discipline" table to CLAUDE.md that maps every
ALLCAPS.md file to the area it covers and the trigger for updating it. This
closes the loop on the ALLCAPS.md documentation system.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
