Code-level conventions for working in this repo — the rules a PR is reviewed against, as opposed to ../specs/ (what to build) and ../decisions/ (why the stack is what it is).
dev-environment.md— bootstrap, services/ports (and collisions), run matrix, gate + e2e commands.routing.md—apps/web/src/routes/: file conventions, route groups, thin route files, option ordering, URL-driven state.testing.md— test tiers, vitest config rule, factory pattern (R1), e2e conventions (locators, error trapping, tags).components.md— composition, compound naming, data-attributes, state patterns, a11y baseline.