Entity-Profile Augmentation Workflow — Common Social + Vertical-Specific Sources, Per Entity Type

A common workflow in augment-it is filling in 'who is this' and 'where are they on the web' for every row in a dataset — LinkedIn, X, BlueSky, YouTube for everyone, plus type-specific sources (ProPublica Nonprofit Explorer + Candid for philanthropic orgs, SEC EDGAR for public companies, Crunchbase for startups, etc.). Today this work happens prompt-by-prompt, one column at a time. This doc converges on a two-tier abstraction: **packs** as atomic, source-bound microfrontend+microservice units (one per data source), and **bundles** as workflow-shaped compositions of packs (a `profile-builder` for philanthropic orgs vs for VC firms). Verification rides the existing Response Reviewer surface with a structured-output extension.