Model-facing Office tools for DeepSeek Harness

Key features

• It exports name / inject / apply / Config
• Registration blocks for awesome-dsh-plugin / dsh-market are in docs/hub-registration.md.
• All file access is confined to the calling agent's session workspace.
• defineTool declares model-visible parameters, a validated canonical output.schema, and a pure output.render text projection.
• execute(args, exec) resolves every path against exec.agent.session.header.cwd