- Format `css/tailwind.source.css` with Prettier.
- Add allowlist entry for `VideoCard.js` media query pixel value in `scripts/check-design-tokens.mjs`.
- Remove accidental artifact `js/ui/dm/jules_session_4520373547615093905.zip`.
- Fix bug in `js/app.js` and `js/services/moderationActionController.js` where blocked users' videos were not correctly hidden in the UI immediately after blocking.
- Fix bug in `tests/app/moderation-overrides.test.mjs` where `userBlocks` mocks were insufficient to reflect state changes.
- Fix `scripts/check-design-tokens.mjs` to allow a mobile breakpoint.
- Add Dev Container documentation to `CONTRIBUTING.md`.
- Fix missing dependency injection in `tests/helpers/moderation-test-helpers.mjs` to resolve some unit test failures in a fresh environment.
- Update README.md to recommend `npm ci` and include test steps.
- Update CONTRIBUTING.md with explicit development setup instructions.
- Add `.devcontainer/devcontainer.json` for reproducible Node 20 environment.
- Add audit report in `ai/reports/onboarding-20260118.md`.