feat: add a tool catalog and local MCP server

Define tools that answer questions from the app's data once, independent
of the surface that exposes them. A tool declares its arguments and the
services it reads; applications compose tools with their own services and
optional call interceptors. Queries reuse the layers' portable source
factories, so they run wherever an application routes /api requests.

The first queries are get_earthquakes, get_active_fires and
get_recent_launches, with a shared area argument (place name, bounding
box, or point and radius) and capped lists.

gods-eye-view/tools/mcp adapts a catalog to the Model Context Protocol
with a small JSON-RPC handler and a stateless HTTP transport, adding no
dependencies. npm run mcp serves Core's tools over stdio to local clients
such as Claude Code, reading from a running app. Both exports are
portable and checked by check:boundaries; the app does not import them.

server/mcp/server.js

@@ -0,0 +1,30 @@
+/** The local MCP server: Core's tools over services backed by a running app. */
+
+import { readFileSync } from 'node:fs';
+import { composeCatalog, coreTools } from '../../src/tools/index.js';
+import { createMcpServer } from '../../src/tools/mcp/index.js';
+import { DEFAULT_API_BASE, createLocalToolServices } from './services.js';
+
+const INSTRUCTIONS =
+  "Tools answer questions from God's Eye View's live public data. Location " +
+  'tools take an area: a place name, a bbox, or lat/lon with radius_km. ' +
+  'Results are capped; check truncated and total before concluding there is nothing more.';
+
+/** Construct the local MCP server for Core's tools. */
+export function createLocalMcpServer({
+  apiBase = DEFAULT_API_BASE,
+  fetchImpl,
+} = {}) {
+  const { version } = JSON.parse(
+    readFileSync(new URL('../../package.json', import.meta.url), 'utf8'),
+  );
+  return createMcpServer({
+    catalog: composeCatalog({
+      tools: coreTools,
+      services: createLocalToolServices({ apiBase, fetchImpl }),
+    }),
+    name: 'gods-eye-view',
+    version,
+    instructions: INSTRUCTIONS,
+  });
+}