Refactor sleep handling and WASM task termination; consolidate platform-specific sleep functions and improve task cleanup logic

software/init.zig

@@ -5,7 +5,7 @@ pub fn main() void {
     while (true) {
         nova64.log("Hello from Zig!");
         // nova64.yield();
-        // nova64.sleep(1000);
+        nova64.sleep(50);
     }
 }