fix(notifications): preserve stamped OSC repaints

src/main/agent-hooks/server.test.ts

@@ -8920,11 +8920,19 @@ describe('AgentHookServer ingestRemote', () => {
 })
 
 describe('AgentHookServer ingestTerminalStatus', () => {
-  it('preserves a hook turn stamp across an equivalent OSC repaint', () => {
+  it('preserves a hook turn stamp when an OSC repaint omits hook-only completion text', () => {
     const server = new AgentHookServer()
     const listener = vi.fn()
     server.setListener(listener)
 
+    server.ingestRemote(
+      {
+        paneKey: PANE,
+        payload: { state: 'working', prompt: 'review the PR', agentType: 'claude' }
+      },
+      'conn-1'
+    )
+    listener.mockClear()
     server.ingestRemote(
       {
         paneKey: PANE,
@@ -8932,6 +8940,7 @@ describe('AgentHookServer ingestTerminalStatus', () => {
           state: 'working',
           prompt: 'review the PR',
           agentType: 'claude',
+          lastAssistantMessage: 'Review complete.',
           turnCompletedAt: 1_700_000_005_000
         }
       },
@@ -8946,8 +8955,20 @@ describe('AgentHookServer ingestTerminalStatus', () => {
     expect(listener).toHaveBeenCalledOnce()
     expect(server.getStatusSnapshot()[0]).toMatchObject({
       state: 'working',
+      lastAssistantMessage: 'Review complete.',
       turnCompletedAt: 1_700_000_005_000
     })
+
+    server.ingestTerminalStatus({
+      paneKey: PANE,
+      connectionId: 'conn-1',
+      payload: { state: 'done', prompt: 'review the PR', agentType: 'claude' }
+    })
+
+    expect(listener).toHaveBeenCalledTimes(2)
+    expect(listener).toHaveBeenLastCalledWith(
+      expect.objectContaining({ payload: expect.objectContaining({ state: 'done' }) })
+    )
   })
 
   it('accepts an identical-prompt hook boundary after a stamped turn', () => {

src/main/agent-hooks/server.ts

@@ -426,7 +426,8 @@ function equivalentParsedAgentStatusPayload(
     a.toolName === b.toolName &&
     a.toolInput === b.toolInput &&
     a.interactivePrompt === b.interactivePrompt &&
-    a.lastAssistantMessage === b.lastAssistantMessage &&
+    (a.lastAssistantMessage === b.lastAssistantMessage ||
+      (preserveActiveTurnStamp && b.lastAssistantMessage === undefined)) &&
     a.interrupted === b.interrupted &&
     // Why: a session-boundary done must never be deduped against a cached real done —
     // the flag has to reach receivers deterministically (STA-3386).

src/renderer/src/components/terminal-pane/agent-completion-coordinator.test.ts

@@ -1373,6 +1373,7 @@ describe('agent completion coordinator', () => {
         state: 'working',
         prompt: 'review the PR',
         agentType: 'claude',
+        lastAssistantMessage: 'Review complete.',
         stateStartedAt: 2_000,
         turnCompletedAt: 2_500
       })