feat: 内核预留 MessagePort 原型与 MessageChannel 构造器槽位

crates/oxide_kernel/src/kernel/builtin_id.rs

@@ -1,4 +1,4 @@
-//! 内置对象 id 枚举（`BuiltinId` 85 变体 + `ALL` 顺序钉表）、世代快照
+//! 内置对象 id 枚举（`BuiltinId` 87 变体 + `ALL` 顺序钉表）、世代快照
 //! （`BuiltinSnapshot`）与按家族划分的脏标记位集（`BuiltinDirtySet`）；
 //! `NUM_BUILTINS` 文档承载"新增 BuiltinWorld 字段须同步"四处约束注记。
 
@@ -11,7 +11,7 @@ use crate::builtin::BuiltinWorld;
 /// 维护注意：每个新增的 `BuiltinWorld` 对象字段都必须加到这里以及
 /// `KernelSession::dirty_since_snapshot()`，以便选择性重置重建正确的
 /// builtin 家族。
-pub const NUM_BUILTINS: usize = 85;
+pub const NUM_BUILTINS: usize = 87;
 
 /// 内置对象枚举 id，与 `BuiltinWorld` 中的存储槽一一对应。
 ///
@@ -105,6 +105,8 @@ pub enum BuiltinId {
     SharedArrayBufferConstructor = 82,
     AtomicsObject = 83,
     AsyncIteratorProto = 84,
+    MessagePortProto = 85,
+    MessageChannelCtor = 86,
 }
 
 impl BuiltinId {
@@ -197,6 +199,8 @@ impl BuiltinId {
         BuiltinId::SharedArrayBufferConstructor,
         BuiltinId::AtomicsObject,
         BuiltinId::AsyncIteratorProto,
+        BuiltinId::MessagePortProto,
+        BuiltinId::MessageChannelCtor,
     ];
 }
 
@@ -272,6 +276,7 @@ pub struct BuiltinDirtySet {
     pub stubs: bool,
     pub global: bool,
     pub console: bool,
+    pub message_channel: bool,
 }
 
 impl BuiltinDirtySet {
@@ -305,6 +310,7 @@ impl BuiltinDirtySet {
             stubs: true,
             global: true,
             console: true,
+            message_channel: true,
         }
     }
 
@@ -332,6 +338,7 @@ impl BuiltinDirtySet {
             || self.temporal
             || self.stubs
             || self.console
+            || self.message_channel
     }
 
     /// 是否存在任何污染（builtin world 或 global object）。
@@ -344,19 +351,21 @@ impl BuiltinDirtySet {
 mod tests {
     use super::*;
 
-    /// 槽对齐面：ALL 表与判别值 0..84 严格同序，快照数组随 NUM_BUILTINS
+    /// 槽对齐面：ALL 表与判别值 0..86 严格同序，快照数组随 NUM_BUILTINS
     /// 自动扩维、逐槽对齐。
     #[test]
     fn builtin_snapshot_all_slots_aligned() {
-        assert_eq!(NUM_BUILTINS, 85);
+        assert_eq!(NUM_BUILTINS, 87);
         assert_eq!(BuiltinId::ALL.len(), NUM_BUILTINS);
-        for i in 0..84usize {
+        for i in 0..86usize {
             assert_eq!(BuiltinId::ALL[i] as usize, i);
         }
         assert_eq!(BuiltinId::ALL[81], BuiltinId::SharedArrayBufferProto);
         assert_eq!(BuiltinId::ALL[82], BuiltinId::SharedArrayBufferConstructor);
         assert_eq!(BuiltinId::ALL[83], BuiltinId::AtomicsObject);
         assert_eq!(BuiltinId::ALL[84], BuiltinId::AsyncIteratorProto);
+        assert_eq!(BuiltinId::ALL[85], BuiltinId::MessagePortProto);
+        assert_eq!(BuiltinId::ALL[86], BuiltinId::MessageChannelCtor);
 
         // 快照经 session 全量构造路径采集，generations 数组维度 = 槽数。
         use crate::kernel::{KernelConfig, KernelCore, KernelSession};

crates/oxide_kernel/src/kernel/session.rs

@@ -196,6 +196,8 @@ impl KernelSession {
                 || gen(BuiltinId::BigIntProto) != snap(BuiltinId::BigIntProto),
             global: BuiltinSnapshot::gen(&self.global_object) != snapshot.global_object_generation,
             console: gen(BuiltinId::Console) != snap(BuiltinId::Console),
+            message_channel: gen(BuiltinId::MessagePortProto) != snap(BuiltinId::MessagePortProto)
+                || gen(BuiltinId::MessageChannelCtor) != snap(BuiltinId::MessageChannelCtor),
         };
         // wrapper 本体被写不落在任何家族位上（写的是 wrapper 自身而非所属 P
         // 对象）：收缩为全脏，强制重建全部家族与 global，使被写的可复用