Run an application-wide, read-only architecture audit that finds materially useful simplifications in a codebase's data structures, state representation, control flow, algorithms, and ownership boundaries. Fans out bounded read-only agents per subsystem, verifies every finding against the repo, and ranks results P0 to P3. Use when asked to audit architecture, review how state or data is modelled, find structural simplifications, or invoke /audit-architecture. Not a style or line-level quality pass (use /simplify for that) and not a bug hunt (use /code-review).