DeepSeek Harness Skills Pack: Legacy Code Modernization Workflow

The DSH plugin `dsh-modernize-code` provides a systematic legacy code modernization workflow for the DeepSeek Harness ecosystem. Implemented through Python scripts, it requires no network access or external services. Its core workflow consists of four stages: environment readiness checks, legacy pattern scanning, migration roadmap creation, and incremental block-by-block migration. It breaks “big-bang” refactoring into controllable steps, supports offline execution, and aims to reduce refactoring risk through a standardized process.