feat(cli): Add stats CLI command and daemon stats aggregation; fix process manager & wrapper state handling

ts/daemon/processwrapper.ts

@@ -93,6 +93,9 @@ export class ProcessWrapper extends EventEmitter {
         this.stdoutRemainder = '';
         this.stderrRemainder = '';
         
+        // Mark process reference as gone so isRunning() reflects reality
+        this.process = null;
+        
         this.emit('exit', code, signal);
       });
 
@@ -269,6 +272,7 @@ export class ProcessWrapper extends EventEmitter {
    * Get the process ID if running
    */
   public getPid(): number | null {
+    if (!this.isRunning()) return null;
     return this.process?.pid || null;
   }
 
@@ -292,7 +296,13 @@ export class ProcessWrapper extends EventEmitter {
    * Check if the process is currently running
    */
   public isRunning(): boolean {
-    return this.process !== null && typeof this.process.exitCode !== 'number';
+    if (!this.process) return false;
+    // In Node, while the child is running: exitCode === null and signalCode === null/undefined
+    // After it exits: exitCode is a number OR signalCode is a string
+    const anyProc: any = this.process as any;
+    const exitCode = anyProc.exitCode;
+    const signalCode = anyProc.signalCode;
+    return exitCode === null && (signalCode === null || typeof signalCode === 'undefined');
   }
 
   /**