feat(smartexit): Add silent logging option, structured shutdown logs, and killAll return stats

readme.hints.md

@@ -1 +1,29 @@
- 
+# SmartExit - Development Hints
+
+## Logging System
+
+The module uses consolidated logging with a `[smartexit]` prefix:
+
+- **Default behavior**: Logs a single summary line on shutdown
+- **Silent mode**: Pass `{ silent: true }` to constructor to disable all logging
+
+### Example output
+```
+[smartexit] Shutdown complete: killed 3 child processes, ran 2 cleanup functions
+```
+
+### Usage
+```typescript
+// Default - logs summary
+const smartExit = new SmartExit();
+
+// Silent - no logging
+const smartExit = new SmartExit({ silent: true });
+```
+
+## killAll() Return Value
+
+The `killAll()` method returns stats about the cleanup:
+```typescript
+const { processesKilled, cleanupFunctionsRan } = await smartExit.killAll();
+```