Reorganize files and add some tests

jest.config.js

@@ -0,0 +1,21 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+export default {
+  preset: 'ts-jest/presets/default-esm',
+  testEnvironment: 'node',
+  extensionsToTreatAsEsm: ['.ts'],
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+  },
+  transform: {
+    '^.+\\.tsx?$': ['ts-jest', { useESM: true }],
+  },
+  transformIgnorePatterns: [
+    'node_modules/(?!(@modelcontextprotocol)/)'
+  ],
+  testMatch: ['**/src/**/__tests__/**/*.test.ts'],
+  collectCoverageFrom: [
+    '**/src/**/*.ts',
+    '!**/src/**/__tests__/**',
+    '!**/dist/**',
+  ],
+};