Bundle size analysis, budget enforcement, and regression detection for Vite/Rollup builds.
This skill should be used when: (1) analyzing bundle composition or total size,
(2) checking size budgets, (3) comparing PR vs baseline for regressions,
(4) investigating why bundle size increased, or (5) optimizing bundle size.
Reads Vite manifest for chunk graph (Tier B). Cannot attribute sizes to specific
npm packages without stats.json (Tier C unavailable by default).