fix: exclude test files from TypeScript build

- Add include/exclude to tsconfig.json
- Exclude tests/, vitest.config.ts, and test files from build
- Fixes TS6059 errors about files not under rootDir

Author: ryanrozich

tsconfig.json

@@ -25,5 +25,16 @@
     "types": [
       "node"
     ]
-  }
+  },
+  "include": [
+    "src/**/*"
+  ],
+  "exclude": [
+    "node_modules",
+    "dist",
+    "tests",
+    "**/*.test.ts",
+    "**/*.spec.ts",
+    "vitest.config.ts"
+  ]
 }