feat: export the globe panel for MCP servers

MCP servers that compose Core's tools can now serve the globe panel:
@gods-eye-view/core/tools/panel exports createGlobePanelResource,
panelRuntime, GLOBE_PANEL_URI and PANEL_BASE. The local MCP server uses
the same entry point.

package.json

@@ -255,6 +255,7 @@
     "./sources/map-features": "./src/sources/overpassFeatures.js",
     "./tools": "./src/tools/index.js",
     "./tools/mcp": "./src/tools/mcp/index.js",
+    "./tools/panel": "./src/tools/panel.js",
     "./tools/services": "./src/tools/services.js",
     "./view": "./src/view/index.js"
   }