L402 Lightning paywall + Depth-of-Identity score gate for MCP. Two integration shapes: (a) stdio MCP server exposing l402_gate_challenge / l402_gate_verify / l402_gate_score for agent clients; (b) drop-in Express middleware + MCP tool factory that combine

{
  "mcpServers": {
    "powforgemcp-l402-gate": {
      "command": "npx",
      "args": [
        "-y",
        "@powforge/mcp-l402-gate"
      ]
    }
  }
}