feat(kanban-artifacts): add dashboard plugin for browsing kanban task artifacts

kanban-artifacts/README.md

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+# kanban-artifacts
+
+Dashboard plugin for browsing and previewing output files from Hermes Kanban task workspaces.
+
+## What it does
+
+Adds a **Kanban Artifacts** tab to the Hermes dashboard (positioned after the built-in Kanban tab). Users can:
+
+- Browse boards and tasks from the Kanban system
+- Explore artifact files in each task's workspace (`~/.hermes/kanban/workspaces/`)
+- Preview text, code, markdown, images, and other common file types inline
+- Download raw files with streaming support (50 MB cap)
+
+## Security
+
+- All API routes require a valid session token (`X-Hermes-Session-Token` or `Authorization: Bearer`)
+- Path traversal is blocked — only `~/.hermes/kanban/workspaces/` and `~/.hermes/kanban/boards/` are accessible
+- Files larger than 50 MB cannot be served via `/raw`
+- SQL injection is prevented with parameterized queries
+- Markdown content is HTML-escaped before rendering to prevent XSS
+
+## File structure
+
+```
+kanban-artifacts/dashboard/
+  manifest.json    — Dashboard plugin manifest (tab, icon, entry point, API file)
+  plugin_api.py    — FastAPI backend (list boards/tasks/files, serve raw files)
+  index.js         — React frontend source
+  dist/
+    index.js       — Built frontend bundle
+    style.css      — Styles
+```
+
+## Installing
+
+Copy the `kanban-artifacts/` directory to:
+
+```
+~/.hermes/plugins/kanban-artifacts/dashboard/
+```
+
+The plugin is auto-discovered by the Hermes dashboard on next startup.
+
+## Reference
+
+- [Hermes Plugin Proposal #8994](https://github.com/NousResearch/hermes-agent/issues/8994)
+- Tracking issue: [Proposal: kanban-artifacts #32473](https://github.com/NousResearch/hermes-agent/issues/32473)

kanban-artifacts/dashboard/dist/style.css

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+/* Kanban Artifacts — dashboard plugin styles */
+
+:root {
+  --plugin-accent: #3b82f6;
+}
+
+[data-plugin="kanban-artifacts"] {
+  font-family: inherit;
+}