Add NoteDiscovery, self-hosted markdown knowledge base with MCP

Adds NoteDiscovery to **Knowledge & Memory**.

NoteDiscovery is a self-hosted plain-markdown notes app (MIT, no telemetry)
with a built-in stdio MCP server. The server exposes tools so AI clients
(Claude Desktop, Cursor, etc.) can search, read, create, edit, tag, and
instantiate templates against the same vault the web UI uses.

- Repo: https://github.com/gamosoft/NoteDiscovery
- Docs: https://github.com/gamosoft/NoteDiscovery/blob/main/documentation/MCP.md
- Live demo: https://gamosoft-notediscovery-demo.hf.space
- Image: `ghcr.io/gamosoft/notediscovery:latest`
- Language: Python (stdio transport)

README.md

@@ -1970,6 +1970,7 @@ Persistent memory storage using knowledge graph structures. Enables AI models to
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