implement-featurelisted

# Implement Feature Autonomously implement a feature from its existing `spec.md` + `plan.md` + `contract.md`. It implements phase-by-phase with per-phase commits, retry policy, and a final verification/AC report, and is **contract-aware** — it must satisfy the contract's environment, quality gates, and observable criteria, and it records the feature's state in `progress.json` so the `evaluator` can pick it up. > Base docs (in this package): `https://github.com/dayvisonassis/sdd-skills/blob/main/docs/Contrato_de_Feature.md`, > `https://github.com/dayvisonassis/sdd-skills/blob/main/docs/Como_criar_gates.md`, > `https://github.com/dayvisonassis/sdd-skills/blob/main/docs/Fluxo_SDD_e_Implementacao_das_Skills.md` (flow + progress.json schema). > Start with `https://github.com/dayvisonassis/sdd-skills/blob/main/docs/GUIA_DO_WORKFLOW.md` for how the skills fit together. ## INPUT Free-form. The skill figures out what was passed. Any combination works: - A feature identifier: `F09`, `Video Upload`, or similar. - A feature folder: `docs/F09-in-video-transcription-search/`, `./F09/`, etc. - A file inside the feature folder: `docs/F09-in-video-transcription-search/spec.md`. - A PRD path: `@docs/PRD.md`, `docs/PRD.md`, `@PRD.md`. - Extra natural-language instructions appended anywhere (see **Overrides**). The skill needs to locate three feature files and one reference source: 1. **`spec.md`, `plan.md`, and `contract.md`** for the target feature. If the input points to a folder, look