fix: add start pending mode to mitigate Terminal output redirection issue

kernel/src/Sched/Scheduler.hpp

@@ -55,6 +55,7 @@ namespace Sched {
         int runningOnCpu;         // CPU index running this process (-1 if not running)
         bool killPending = false; // Set by Sys_Kill when target is running on another CPU
         bool reapReady = false;   // Set once teardown is complete and BSP may free slot resources
+        bool startPending = false; // Spawned but not yet made runnable
 
         // I/O redirection for GUI terminal
         bool redirected = false;
@@ -85,7 +86,8 @@ namespace Sched {
     };
 
     void Initialize();
-    int Spawn(const char* vfsPath, const char* args = nullptr);
+    int Spawn(const char* vfsPath, const char* args = nullptr, bool startReady = true);
+    int StartProcess(int pid);
     void Schedule();
 
     // True when there is runnable work somewhere in the process table.