l-etf

Use when the user wants a data-quality review of the generated CSV files in public/, especially after fetch-data or stitching changes. Audit the current CSV set for duplicates, date/order issues, suspicious jumps, stitch-boundary continuity, and cross-file consistency using DataFetch.md and scripts/fetch-data.ts as the source of truth.

Use when the user wants a one-time or periodic cleanup of unused code in this repo, including dead files, unused components/functions/constants, dead exports, and stale package dependencies. Follow the repo's cleanup workflow with Knip, ESLint, and build verification, and keep the cleanup isolated in its own commit.