Deployment Notes

FEATURE_DESIGN_SYSTEM rollout

Default: false (legacy styling). The flag lives in js/constants.js and is exposed through window.__BITVID_RUNTIME_FLAGS__ at runtime.
Enable for canaries: Before deploying a canary, run window.__BITVID_RUNTIME_FLAGS__.FEATURE_DESIGN_SYSTEM = true (or call setFeatureDesignSystemEnabled(true)) in the browser console. The change propagates immediately, flipping every [data-ds] container to data-ds="new" so controllers can hydrate the updated primitives.
Disable / rollback: Set the flag back to false via the runtime object or redeploy with the default configuration. All root containers revert to data-ds="legacy", forcing controllers and templates to stay on the existing class list.
Template contract: Every layout, view, and partial now includes data-ds on the root element. Keep this attribute intact when editing HTML so the runtime can swap modes without re-rendering.
Controllers: UI controllers receive a designSystem context in their constructors. Call context.isNew() before attaching new components or classes, and lean on context.getMode() when logging or telemetry need to differentiate between legacy and new renders.