Analyze an existing repository in read-only mode to reconstruct current behavior, architecture, dependency clusters, build and test health, hotspots, tech debt, ownership boundaries, integration points, and current-vs-target gaps. Use for existing-product improvement, migration planning, code archaeology, risky refactors, unfamiliar repositories, or artifacts `80-current-state-scan.md` through `85-migration-plan.md` before writing code.
