fix(kernel): fix kill wait-queue cleanup, RegionId tracking, ReleasePages ownership, and SwitchTo scheduler state

crates/domain/src/scheduler/multi_core.rs

@@ -34,6 +34,10 @@ impl MultiCoreScheduler {
         self.cores[core.raw() as usize].current()
     }
 
+    pub fn set_current(&mut self, core: CoreId, thread: ThreadId) {
+        self.cores[core.raw() as usize].set_current(thread);
+    }
+
     fn thread_count_on(&self, core: CoreId) -> usize {
         self.placements
             .iter()