feat: add typed wire format for stream-json protocol (#445)

Co-authored-by: Letta <noreply@letta.com>

build.js

@@ -75,6 +75,11 @@ if (existsSync(bundledSkillsSrc)) {
   console.log("📂 Copied bundled skills to skills/");
 }
 
+// Generate type declarations for wire types export
+console.log("📝 Generating type declarations...");
+await Bun.$`bunx tsc -p tsconfig.types.json`;
+console.log("   Output: dist/types/wire.d.ts");
+
 console.log("✅ Build complete!");
 console.log(`   Output: letta.js`);
 console.log(`   Size: ${(Bun.file(outputPath).size / 1024).toFixed(0)}KB`);