dsh-matt-pipeline: Visualize Matt Pocock Skills Workflow in DSH sidebar

# Introduction When developing agents with DSH, a common approach is to break down tasks into fixed stages: first capturing ideas, then filtering, refining through questioning, writing specifications, breaking down tickets, and finally implementing and reviewing them one by one. If each step corresponds to a skill, the user must remember the skill names and manually type `/skill` commands one by one. After completing a single cycle, seven or eight commands are memorized, and if interrupted, the user must recall where they left off. `dsh-matt-pipeline` solves this problem: it registers Matt Pocock's set of skill workflows into DSH and provides a visual pipeline panel in the sidebar. A single click dispatches the corresponding skill to the current session. # What is dsh-matt-pipeline (Version 0.2.0, MIT