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

crates/domain/src/endpoint/mod.rs

@@ -61,6 +61,14 @@ impl Endpoint {
         !self.waiting_receivers.is_empty()
     }
 
+    pub fn remove_sender(&mut self, thread: ThreadId) -> bool {
+        self.waiting_senders.remove_thread(thread)
+    }
+
+    pub fn remove_receiver(&mut self, thread: ThreadId) -> bool {
+        self.waiting_receivers.remove_thread(thread)
+    }
+
     pub fn revoke(&mut self) {
         self.generation = self.generation.next();
     }
@@ -97,6 +105,15 @@ impl EndpointTable {
     pub fn destroy(&mut self, id: EndpointId) -> Option<Endpoint> {
         self.endpoints.get_mut(id.raw() as usize).and_then(|s| s.take())
     }
+
+    pub fn remove_thread_from_all(&mut self, thread: ThreadId) {
+        for slot in &mut self.endpoints {
+            if let Some(ep) = slot {
+                ep.remove_sender(thread);
+                ep.remove_receiver(thread);
+            }
+        }
+    }
 }
 
 pub trait MessagePassing {