more internal polish, resilient workers

crates/executor/src/main.rs

@@ -9,14 +9,18 @@
 //! - Handles human-in-the-loop inquiries
 
 mod completion_listener;
+mod dead_letter_handler;
 mod enforcement_processor;
 mod event_processor;
 mod execution_manager;
 mod inquiry_handler;
 mod policy_enforcer;
 mod queue_manager;
+mod retry_manager;
 mod scheduler;
 mod service;
+mod timeout_monitor;
+mod worker_health;
 
 use anyhow::Result;
 use attune_common::config::Config;