dsh-subagent-cwd: Add per-call cwd for DSH sub-agent calls

The DSH plugin dsh-subagent-cwd (MIT licensed) enhances sub-agent delegation capabilities based on dsh-subagent-tools. It introduces a core new per-call `cwd` parameter, allowing the specification of the working directory for a single `subagent` or `subagent_fork` call. It still supports per-call overrides for `model`, `provider`, `persona`, and `toolFilter`, as well as `@preset:` references and provider/model combination IDs. Implementing the per-call `cwd` feature relies on two in-process provider patches. The plugin comes with installation scripts for Windows (`install.ps1`) and POSIX (`install.sh`).

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dsh-file-viewer: Read-only file preview in DeepSeek Harness

`dsh-file-viewer` is a read-only file preview plugin for DeepSeek Harness, maintained by `liguobao` (MIT License, v0.3.1). It allows direct previewing of files such as images, PDFs, CSVs, Markdown, JSON, YAML, source code, and large logs directly within the web page, without relying on external applications. Strictly adhering to the "Preview ≠ Execute" principle, it prohibits the execution of scripts, macros, or commands to ensure security. The plugin supports a tiered loading strategy for large files (<5MB read entirely, 5-50MB chunked, >50MB load header only) and provides the `fileViewer.openFile` API, supporting opening local paths, `artifact://` locators, specifying line numbers, and forcing a specific renderer.

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