What problem does it solve? Turning a project implementation plan into production-quality code often fails because specs are vague, phases ship half-finished, and reviews get skipped. This Skill enforces a disciplined workflow: polish the relevant feature specs until they are implementation-ready, build exactly one phase of the impl plan, run strict quality gates, and complete an independent code review before declaring done. ## Core Features & Use Cases - Spec-first gating: Expands and polishes feature specs, diagrams, and the impl plan under ./specs until another engineer could implement the phase without guessing, before any production code is written. - Phase-scoped implementation: Works through the phase's task table in dependency order with typed, tested, benchmarked code and no TODOs, stubs, or gate bypasses. - Independent review loop: Spawns a review subagent against the polished specs, fixes valid in-phase findings, and records out-of-phase items in a deferred-findings backlog spec. - Use Case: A user says "build phase 2 entirely" — the Skill reads the impl plan and cited specs, polishes them, implements each task, runs ruff, mypy --strict, pytest, and security checks, then reviews the diff and reports exit criteria with evidence. ## Quick Start Use the impl skill to polish the relevant specs and build phase 2 of the impl plan end-to-end, then run the independent review.
