Add the "domain vocabulary lives in Rust" principle, the
check:boundary pre-commit gate, and a spec-writing section pointing at
the spec template and review checklist.
Add a docs-site (mdBook) with a Gitea publish-docs workflow, a
release-notes generator script (release:notes) that turns a commit
range's TRACES into grouped notes, the background-audio feature spec,
and CLAUDE.md. Ignore docs-site build artifacts.
dtourolle