Build agent in derivation

src/agent.jazz

@@ -1,7 +1,7 @@
 from Jade require "crypto_scalarmult/curve25519/amd64/mulx/curve25519.jinc"
 
-export fn main(reg u64 p) -> reg u64 {
-    reg u64 ret;
-    ret = 0;
-    return ret;
+export fn agent_start(reg u64 shared_mem sync_mem) {
+    while (true) {
+        
+    }
 }