fix: full init boot logic works — CreateProcess no longer spawns threads, boot uses out-param to avoid sret bug

- CreateProcess only creates process + grants cap, no thread spawning
- boot::boot takes &mut BootResult instead of returning it (fixes -> ! sret convention issue)
- Init creates 6 server processes, sets up supervisor, enters receive loop
- No faults on QEMU with full boot sequence

crates/kernel/src/syscall/lifecycle.rs

@@ -56,27 +56,6 @@ impl<P: Platform> Kernel<P> {
         self.process_memory[new_pid.raw() as usize] =
             Some(domain::memory::process_memory::ProcessMemory::new(new_pid, 1024));
 
-        let priority = types::bounded::Priority::new(16)
-            .unwrap_or_else(|| unreachable!());
-        let time_slice = types::time::TimeSlice::new(100);
-
-        let tid = match self.threads.spawn(new_pid, priority, time_slice, None) {
-            Ok(t) => t,
-            Err(e) => {
-                let _ = self.processes.destroy(new_pid);
-                return SyscallOutcome::Complete(SyscallResult::Error(e));
-            }
-        };
-
-        if let Err(e) = self.processes.get_mut(new_pid).and_then(|p| p.add_thread(tid)) {
-            let _ = self.threads.destroy(tid);
-            let _ = self.processes.destroy(new_pid);
-            return SyscallOutcome::Complete(SyscallResult::Error(e));
-        }
-
-        let core = self.platform.core_id();
-        self.scheduler.add(tid, priority, core);
-
         let slot = match self.grant_cap(
             caller_pid,
             domain::resource::Resource::Process(new_pid),