dsh-adhd-copilot: Deconstruct "want to do but can't move" into a portable minimal action

`dsh-adhd-copilot` is a behavior coaching skill for the DeepSeek Harness plugin ecosystem, designed to help ADHD users reduce task initiation costs. It scans tasks and status signals via the `adhd_breakdown` tool, routing requests to specific modules based on the priority of "Emotion > Structure > Initiation," compressing complex requests into a single, executable "minimum next step action" rather than providing lengthy plans. Core mechanisms include a "Pre-flight Gate" (silent when no task signal is detected, answering trivial requests directly), an "A-G Self-Service Menu" (to assist users in choosing a direction when signals are ambiguous), and strict output discipline (first line must be an action, steps $\le$ 3, short duration per step, and prohibition of fake status updates). The plugin adopts a pure ESM architecture with zero build and zero dependencies, supporting Battery Mode and Narrative Style.