Configures Lighthouse CI (`@lhci/cli`) to audit Web Vitals (LCP, INP, CLS) on every PR, asserts against canonical thresholds (LCP ≤2.5s, INP ≤200ms, CLS ≤0.1 at the 75th percentile), uploads Lighthouse reports as build artifacts, and posts deltas as PR comments. Use when the project ships a web frontend and the team needs continuous Web Vitals monitoring tied to PR gating.