Adopt dependency-cruiser as the single declarative source for bounded-context + atomic-layer boundaries, replacing the per-context no-restricted-imports blocks that had to be hand-copied (and had left herregistratie uncovered). `.dependency-cruiser.js` encodes context direction (everyone→shared, herregistratie→registratie, showcase→*), domain-purity, contracts-import-nothing, ui↛infrastructure, ApiClient confinement, and no-circular. `npm run dep:check` enforces (wired into ci-local.sh + the frontend CI job); `npm run dep:graph` emits a committed mermaid context×layer graph. ESLint slimmed to no-explicit-any + template a11y. Docs + new-context skill updated to the single source. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>