dsh-agentero-annotations: Fully display text annotations in the Agentero PDF viewer

The DSH client plugin `dsh-agentero-annotations` (v0.1.3), maintained by yellkiin, introduces a collapsible text annotation panel in the Agentero PDF reader. This addresses the issue where comments fall outside the viewport when using the default "Fit to Width" setting. It supports per-page and full-document views, comment search, and page navigation, while merging PDF embedded comments with Agentero annotations without invoking a model. Prerequisites include installing `@poco-ai/agentero-dsh`, followed by a local npm build and loading into the web profile via `install.mjs`. The plugin has been verified on DSH 0.2.2-rc.1 and Agentero 0.1.5. Licensed under the MIT License.