What problem does it solve? Coordinating multi-story feature implementation across governance, control, and target repositories is error-prone: branches drift out of sync, story queues lose track of completed work, and constitution hard gates get skipped. This Skill automates the dev-phase lifecycle so stories are validated, delegated, tested, committed, and checkpointed in a consistent order. ## Core Features & Use Cases - Phase Entry Validation: Verifies feature.yaml phase gates, sprint-status.yaml, story files, target repo state, and dev-session.yaml integrity before any work begins, with hard-stop errors on violations. - Story Queue & Execution Loop: Builds a dependency-aware ready queue from sprint-status.yaml, delegates each story to implementation skills, runs focused pytest suites, and commits with structured messages. - Constitution Hard Gate Enforcement: Resolves the domain constitution and blocks any story whose plan violates mandatory requirements before delegation. - Sprint Boundary & Auto-Complete: Pauses at sprint boundaries by default, or continues across sprints and hands off to the complete runtime when the user requests all-stories execution. - Use Case: After FinalizePlan approval of a feature, run the dev phase to implement all stories in epic 2, with automatic branch prep, per-story commits, and crash recovery from the dev-session checkpoint. ## Quick Start Run the dev phase for feature checkout-flow in epic 2 using the governance and control repos already configured for this project.