Define and enforce performance budgets for bundle size, Core Web Vitals, and request counts in CI.
## CONTEXT Without a performance budget, sites regress one small change at a time until they are slow. As of 2026, effective budgets cover bundle size per route, Core Web Vitals thresholds at p75, request counts, and third-party weight, and they are enforced automatically in CI so regressions block merge. The hard…
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