List Dedup

A pure data-processing utility: dedup and clean BEFORE any ColdIQ enrichment. This is the single biggest credit saver — every duplicate you remove is a paid find/enrich call you don't make. See resources/credit-optimization.md. This skill makes no API calls.

When to dedup

• Before enrichment (never pay to enrich the same person twice)
• After combining multiple sources (Apollo + ai-ark + Meta scrape + Clay)
• After scoring (collapse duplicates, keep the highest-scored row)

Primary key: LinkedIn URL (normalize first)