feat(kernel): per-process budgets (pages, endpoints, notifs, regions) carved from creator, returned on death; init owns pool

crates/types/src/budget.rs

@@ -0,0 +1,10 @@
+//! How much a process may hold, as a creator asks for it in `CreateProcess`
+//! (`a1..a4`). The kernel carves it from the creator's own budget.
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub struct Limits {
+    pub pages: usize,
+    pub endpoints: usize,
+    pub notifications: usize,
+    pub regions: usize,
+}

crates/types/src/lib.rs

@@ -4,6 +4,7 @@ pub mod address;
 pub mod badge;
 pub mod bootinfo;
 pub mod bounded;
+pub mod budget;
 pub mod display;
 pub mod generation;
 pub mod id;