Enrich my company list with decision-maker contacts

Here is a list of companies: [paste list or sheet link]. For each company, find up to 3 decision-makers matching these titles, prioritizing seniority: [CEO, VP Marketing, Head of Partnerships]. For each contact get: first name, last name, title, company, email (only if verifiable), LinkedIn URL. De-duplicate by email. Companies with zero results go in a separate "not found" list. Write results into a spreadsheet as you go, and work in parallel where you can. Don't stop until every company is processed.