* chore: apply prettier formatting across the codebase Apply `prettier --write` to all `{ts,tsx,js,jsx,mjs,cjs,json,md,yaml,yml}` files in a single pass so the codebase matches the formatting enforced by the pre-commit hook. This is a mechanical, whitespace-only change. Closes #799 (formatting pass portion). * ci: enforce prettier formatting in CI Add a check_formatting job to apply_pr_checks.yaml that runs `prettier --check` over the same file set the pre-commit hook formats, via actions/setup-node (no Docker, so docker-compose.yaml is untouched). Broaden the root `npm run format` script to the same `{ts,tsx,js,jsx,mjs,cjs,json,md,yaml,yml}` glob so `npm run format`, lint-staged, and CI all agree on scope. Document the new job and its local reproduction command in AGENTS.md. Closes #799 (CI enforcement portion). * build: add prettier and prettier:fix scripts; use them in CI Centralize the whole-repo Prettier glob into two root package.json scripts so CI and local dev share one source of truth: - `npm run prettier` -> prettier --check (used by the check_formatting CI job) - `npm run prettier:fix` -> prettier --write - `npm run format` -> alias of prettier:fix (kept for backwards compat) CI now runs `npm run prettier` instead of duplicating the glob inline. The pre-commit hook (lint-staged) intentionally keeps the scoped `prettier --write` so it only touches staged files; using the whole-repo glob there would reformat the entire codebase on every commit. Update AGENTS.md, docs/development/local.md, and copilot-instructions.md to reference the canonical script names.