refactor

Refactors code toward project-guideline compliance and testability (so /optimus:unit-test can safely increase coverage) across four analysis lenses, fanned out to parallel agents when the scope warrants it. Supports "testability" or "guidelines" focus plus flexible scoping. Read-only until the user approves the plan; applied changes stay local. Use after /optimus:init, before /optimus:unit-test, or for an iterative…