refactor: modularity fixes + plugin registry + compiled research

purpose_agent/hitl.py

@@ -390,7 +390,7 @@ class HITLOrchestrator:
 
         # Post-task
         result = TaskResult(trajectory=trajectory, final_state=current_state)
-        self.orch._post_task(trajectory, [])
+        self.orch.post_task(trajectory, [])
         return result
 
     def inject_heuristic(self, pattern: str, strategy: str, tier: str = "strategic") -> None:
@@ -403,7 +403,7 @@ class HITLOrchestrator:
             q_value=1.0,  # Human-taught = maximum confidence
         )
         self.orch.optimizer.heuristic_library.append(h)
-        self.orch._sync_memory()
+        self.orch.sync_memory()
         logger.info(f"Injected heuristic: '{pattern}' → '{strategy}'")
 
     def _save_checkpoint(