Workflow-driven skill that builds the integration-test suite for a serverless application from its IaC definition (SAM template / serverless.yml / Wrangler config / Vercel functions / Netlify functions). Walks through: identifying the function inventory + event sources, picking the right local-emulator per function (sam local / Miniflare / netlify dev / vercel dev / serverless-offline), generating test events per event source, asserting on cold-start + timeout budgets, and emitting the test directory + CI config. Use when introducing integration tests to a serverless project.