Adds a UI-focused skill that fills a measurable gap in the library: no
existing skill covers bundle-size analysis, code splitting, lazy route
loading, or render-waste diagnosis for React UI bundles (0 mentions of
vitest/web vitals/code splitting across all 87 skills).
The workflow is grounded in this repo's own samples: the Property
Management sample builds a single 1,104 kB entry chunk (Vite warns), and
applying the skill's route-splitting + manualChunks steps reduces it to a
50 kB entry with 9-16 kB lazy route chunks, verified end-to-end at
runtime. Includes scripts/analyze-bundle.mjs, a budget checker that exits
non-zero for CI gating, and documents the substring-matching pitfall where
id.includes('react') silently absorbs lucide-react into the react chunk.
