dsh-context-console: DeepSeek Harness Context Workbench

`dsh-context-console` is the next-generation context management plugin for DeepSeek Harness (DSH). It integrates session trajectory visualization, categorized management of Prompts, Skills, and MCPs, cache observability, message forging, and log repair, replacing `dsh-assistant-message-forge`. The plugin supports inline editing, simulated message injection, JSONL log repair, and subagent trajectory display. Installation requires invoking pnpm via Corepack, and it is recommended to uninstall the old plugin to avoid conflicts. Data is stored under `$DSH_HOME/context-console/`, with comprehensive version compatibility notes and security boundaries.