fix: contracts single source of truth, route health smoke test, README setup, and price-tick motion - #996

Process completed with exit code 1.

command (/home/runner/work/interface/interface/apps/web) /home/runner/.bun/bin/bun run lint exited (1)

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/