What problem does it solve? Before merging changes to the Rango router codebase, developers must manually run format, typecheck, lint, and unit tests, then remember to check whether public API exports changed and whether skills or internal docs need updating. This Skill automates that pre-merge readiness review in one guided workflow. ## Core Features & Use Cases - Parallel quality checks: Runs format, typecheck, lint, and unit tests concurrently and reports failures before continuing. - Public API change detection: Diffs the working tree against known export surface files and flags added, removed, or renamed exports, then reports which skills and docs may need updates without auto-editing them. - Semantic matrix gating: Detects changes to semantic-critical router files and runs Playwright semantic-matrix tests in dev and production. - Use Case: After refactoring a router export, run this Skill to confirm all checks pass, get a list of affected docs and skills, and receive a suggestion to run /simplify on non-trivial new code. ## Quick Start Ask the assistant to run the prepare skill to validate the current changes before merging.