fix(prompt): treat post-dispatch failures as accepted

src/shared/model-suggestion-retry.test.ts

@@ -402,7 +402,7 @@ describe("promptWithModelSuggestionRetry", () => {
     expect(promptMock).toHaveBeenCalledTimes(1)
   })
 
-  it("#given promptAsync throws after dispatch was attempted #when caller observes the error #then the post-dispatch hold remains reserved", async () => {
+  it("#given promptAsync throws after dispatch was attempted #when caller observes ambiguous EOF #then it treats the prompt as accepted and keeps the hold", async () => {
     // given
     const promptMock = mock().mockRejectedValueOnce(new Error("JSON Parse error: Unexpected EOF"))
     const client = { session: { promptAsync: promptMock } }
@@ -415,9 +415,7 @@ describe("promptWithModelSuggestionRetry", () => {
     }
 
     // when
-    await expect(
-      promptWithModelSuggestionRetry(unsafeTestValue(client), args)
-    ).rejects.toThrow("Unexpected EOF")
+    await promptWithModelSuggestionRetry(unsafeTestValue(client), args)
     const second = await dispatchInternalPrompt({
       mode: "async",
       client,
@@ -623,6 +621,24 @@ describe("promptSyncWithModelSuggestionRetry", () => {
     expect(receivedSignal?.aborted).toBe(true)
   })
 
+  it("#given sync prompt throws after dispatch was attempted #when caller observes ambiguous EOF #then it treats the prompt as accepted", async () => {
+    // given
+    const promptMock = mock().mockRejectedValueOnce(new Error("JSON Parse error: Unexpected EOF"))
+    const client = { session: { prompt: promptMock } }
+
+    // when
+    await promptSyncWithModelSuggestionRetry(unsafeTestValue(client), {
+      path: { id: "session-sync-ambiguous-eof" },
+      body: {
+        parts: [{ type: "text", text: "hello" }],
+        model: { providerID: "anthropic", modelID: "claude-sonnet-4" },
+      },
+    })
+
+    // then
+    expect(promptMock).toHaveBeenCalledTimes(1)
+  })
+
   it("should retry with suggested model on ProviderModelNotFoundError", async () => {
     // given a client that fails first with model-not-found, then succeeds
     const promptMock = mock()