Build a person audience from an owned list — customers, leads, accounts — resolving it to Watt entity IDs and emitting a roster, or learning what defines it and handing back a tunable signal pool. The list-anchored way into a build, behind /watt:audience. Four plays — resolve-only, expand (households via addresses), lookalike (the signals that define the list, to tune), overlay (score and rank against signals); group and traverse aren't built. Produces a roster of entity IDs or a signal pool — never an export, never contact data. Not a user command — /watt:audience is the front door. Use when a list arrives to build from — "match my customer list", "find more like my customers", "rank my list by intent", "score the people from my last run". A read intent is audience-analyze-list.