Replaced tsconfig.build.json with tsdown configuration for simplified builds.

package.json

@@ -7,6 +7,9 @@
     "type": "git",
     "url": "git+https://github.com/jakejarvis/rdapper.git"
   },
+  "bugs": {
+    "url": "https://github.com/jakejarvis/rdapper/issues"
+  },
   "author": {
     "name": "Jake Jarvis",
     "email": "jake@jarv.is",
@@ -14,6 +17,7 @@
   },
   "type": "module",
   "main": "./dist/index.js",
+  "module": "./dist/index.js",
   "types": "./dist/index.d.ts",
   "exports": {
     ".": {
@@ -26,13 +30,12 @@
     "dist"
   ],
   "scripts": {
-    "clean": "rm -rf dist",
-    "build": "npm run clean && tsc -p tsconfig.build.json",
-    "test": "npm run clean && tsc -p tsconfig.json && vitest run",
-    "test:watch": "npm run clean && tsc -p tsconfig.json && vitest",
-    "test:coverage": "npm run clean && tsc -p tsconfig.json && vitest run --coverage",
-    "test:smoke": "SMOKE=1 npm run test",
-    "lint": "biome check --write",
+    "build": "tsdown",
+    "dev": "tsdown --watch",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest",
+    "test:run": "vitest run",
+    "lint": "biome check",
     "prepublishOnly": "npm run build"
   },
   "dependencies": {
@@ -42,7 +45,7 @@
     "@biomejs/biome": "2.2.4",
     "@types/node": "24.5.2",
     "@types/psl": "1.1.3",
-    "@vitest/coverage-v8": "^3.2.4",
+    "tsdown": "0.15.5",
     "typescript": "5.9.2",
     "vitest": "^3.2.4"
   },