chore: move to tsdown (#1211)

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

tsdown.config.ts

@@ -0,0 +1,31 @@
+import { defineConfig } from 'tsdown';
+import { baseConfig, mergeConfig } from '@tm/build-config';
+import { load as dotenvLoad } from 'dotenv-mono';
+
+dotenvLoad();
+
+// Get all TM_PUBLIC_* env variables for build-time injection
+const getBuildTimeEnvs = () => {
+	const envs: Record<string, string> = {};
+	for (const [key, value] of Object.entries(process.env)) {
+		if (key.startsWith('TM_PUBLIC_')) {
+			// Return the actual value, not JSON.stringify'd
+			envs[key] = value || '';
+		}
+	}
+	return envs;
+};
+
+export default defineConfig(
+	mergeConfig(baseConfig, {
+		entry: {
+			'task-master': 'scripts/dev.js',
+			'mcp-server': 'mcp-server/server.js'
+		},
+		outDir: 'dist',
+		copy: ['public'],
+		// Bundle only our workspace packages, keep npm dependencies external
+		noExternal: [/^@tm\//],
+		env: getBuildTimeEnvs()
+	})
+);