What problem does it solve? It prevents silent plan drift, duplicated logic, and unmaintainable code by enforcing a disciplined implementation workflow driven by a written plan in .plans/<task-slug>/. ## Core Features & Use Cases - Plan-as-contract execution: Refuses to code without PLAN.md, stops on blockers, and records human-approved changes in AMENDMENTS.md before continuing. - Ownership and reuse enforcement: Prefers extending existing owner modules over creating parallel helpers, and prohibits backward-compatibility shims unless explicitly required. - Review-fix loop and handoff: Treats routed review findings as immediate work, validates the risky path, commits each pass with a Conventional Commit, and reports back to the requester. - Use Case: A lead agent assigns a planned refactoring task; the skill repairs packet drift, implements the change in reviewable increments, runs targeted validation, commits, and hands off with updated packet artifacts. ## Quick Start Implement the task defined in the current task packet under .plans, following PLAN.md strictly and committing the result before reporting back.