feat: add NeuroStack to community servers

[raphasouthall]

NeuroStack is a local-first MCP server for Markdown knowledge graphs with semantic search, prediction error tracking, and Leiden community detection. PyPI: neurostack, repo: https://github.com/raphasouthall/neurostack

What it is: A local-first MCP server that indexes a Markdown vault (Obsidian-compatible) and exposes 9 tools to Claude Code, Cursor, or any MCP-compatible AI tool:

• vault_search — hybrid FTS5 + semantic search
• vault_graph — wiki-link neighbourhood with PageRank
• vault_summary, vault_triples, vault_stats, vault_communities
• vault_prediction_errors — surfaces notes that appeared in unexpected retrieval contexts
• vault_record_usage, session_brief

Quick facts:

• Install: pip install neurostack
• License: Apache-2.0
• Python 3.11+, SQLite/FTS5 — no GPU required in Lite mode
• 99 tests, CI passing, no telemetry, read-only vault access

Links:

• Repo: https://github.com/raphasouthall/neurostack
• PyPI: https://pypi.org/project/neurostack/

[olaservo]

Thanks for contributing to the MCP servers repo!

We've retired the third-party server list from the README in favor of the MCP Registry — see #3950 for context. The Official Integrations and Community Servers sections no longer exist in the README, so this PR no longer has a target.

Going forward, please publish your server to the MCP Registry using the quickstart guide:
https://github.com/modelcontextprotocol/registry/blob/main/docs/modelcontextprotocol-io/quickstart.mdx

That's where server discovery now happens. Thanks for building on MCP!

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Note: I'm working through the backlog with help from Claude Code to give everyone a prompt response.