fix: 收口上下文压缩生命周期边界

tests/unit/opencode-session-state.test.ts

@@ -204,7 +204,7 @@ describe('OpenCode native session state', () => {
     ]);
   });
 
-  it('allows only the latest compaction in an active snapshot to remain running', () => {
+  it('hydrates cold compaction snapshots as completed even while the session is busy', () => {
     const state = hydrateOpenCodeSession('ses_1', [{
       info: { id: 'msg_1', role: 'assistant', sessionID: 'ses_1' },
       parts: [
@@ -214,7 +214,50 @@ describe('OpenCode native session state', () => {
     }], 'busy');
 
     expect(getOrderedSessionCompactions(state).map((event) => event.status))
-      .toEqual(['completed', 'running']);
+      .toEqual(['completed', 'completed']);
+  });
+
+  it('does not attach a historical compaction to a later ordinary busy run', () => {
+    const current = hydrateOpenCodeSession('ses_1', [{
+      info: { id: 'msg_2', role: 'user', sessionID: 'ses_1' },
+      parts: [{ id: 'text_2', type: 'text', text: 'continue normally' }],
+    }], 'busy');
+    const state = hydrateOpenCodeSession('ses_1', [
+      {
+        info: { id: 'msg_1', role: 'assistant', sessionID: 'ses_1' },
+        parts: [{ id: 'compact_1', type: 'compaction', auto: true }],
+      },
+      {
+        info: { id: 'msg_2', role: 'user', sessionID: 'ses_1' },
+        parts: [{ id: 'text_2', type: 'text', text: 'continue normally' }],
+      },
+    ], 'busy', current);
+
+    expect(getOrderedSessionCompactions(state)).toEqual([
+      expect.objectContaining({ nativePartID: 'compact_1', status: 'completed' }),
+    ]);
+  });
+
+  it('keeps a matching real-time native compaction running during active hydration', () => {
+    const current = reduceOpenCodeEvent(
+      hydrateOpenCodeSession('ses_1', [], 'busy'),
+      {
+        type: 'message.part.updated',
+        payload: {
+          sessionID: 'ses_1',
+          messageID: 'msg_1',
+          part: { id: 'compact_1', type: 'compaction', auto: true },
+        },
+      },
+    );
+    const state = hydrateOpenCodeSession('ses_1', [{
+      info: { id: 'msg_1', role: 'assistant', sessionID: 'ses_1' },
+      parts: [{ id: 'compact_1', type: 'compaction', auto: true }],
+    }], 'busy', current);
+
+    expect(getOrderedSessionCompactions(state)).toEqual([
+      expect.objectContaining({ nativePartID: 'compact_1', status: 'running' }),
+    ]);
   });
 
   it('does not downgrade a completed compaction during busy history hydration', () => {