mastermind-diagnose

Mastermind diagnose — forensic procedure for investigating why agent work stalled, looped, or went too deep. Surfaces the exact stop-point in the issue tree, frames the fix as a product rule respecting three invariants (productive work continues / only real blockers stop work / no infinite loops), and delivers an approved plan before any code changes. Mirrors diagnose-why-work-stopped Paperclip skill.