build: eslint config and lint script (CL-9069)

Matches corbits-ollama-adapter's config and tool versions; CI runs it.

Author: TheGreatAxios

.github/workflows/ci.yml

@@ -21,6 +21,7 @@ jobs:
           bun-version: latest
       - run: bun install --frozen-lockfile
       - run: bunx tsc --noEmit
+      - run: bun run lint
       - run: bun run test
       - run: bunx prettier --check src tests
       - run: bun run build