Artifact Space: View valid artifacts by session in the DSH sidebar

Artifact Space is a DSH client plugin with package name `@xxjxx/artifact-space`, version 1.4.0, and an MIT license. It adds an entry in the sidebar, listing valid artifacts within each session that were written via `presented` declarations or `write`/`edit`/`str_replace_editor` and remain on disk, organized hierarchically by workspace and session. It provides editor-style previews, renders Markdown, HTML, YAML, JSON, and images based on file extensions, and features three-level search and localStorage favorites. The host side registers two authentication routes, `artifact-space.rows` and `artifact-space.read`, while the browser side registers the sidebar entry and the main panel. It can be installed via the plugin market or `dsh plugin add @xxjxx/artifact-space`, and requires DSH >= 0.1.5-alpha.2. This plugin runs with the current DSH process permissions; the source code and license should be reviewed before installation.