docs: Quickstart guide & drop-in configuration for popular MCP servers (filesystem, git, sqlite)

[mahirhir]

Summary

To help developers immediately protect their MCP setups with pre-commit inverse escrow and DSSE receipts, we should add copy-pasteable configuration examples for popular MCP servers in docs/guides/mcp-quickstart.md:

1. Filesystem MCP (@modelcontextprotocol/server-filesystem)
2. Git MCP (@modelcontextprotocol/server-git)
3. SQLite / Postgres MCP
4. Shell / Command Execution MCP

Example format

{
  "mcpServers": {
    "filesystem": {
      "command": "gx",
      "args": ["wrap", "--", "npx", "-y", "@modelcontextprotocol/server-filesystem", "/path/to/repo"]
    }
  }
}

Good first issue for anyone wanting to improve developer onboarding documentation.

[mahirhir]

Status as of 2026-09-01: docs/TUTORIAL.md now walks the full MCP substrate loop (submit → plan → verify → commit → undo behind a real MCP server), which covers the concepts. The specific deliverable here — copy-pasteable per-server config snippets (filesystem / git / sqlite / shell) in docs/guides/mcp-quickstart.md — still does not exist. Still a good first issue.