feat(chat): surface model switch warning messages in chat (#1239)

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatModelSwitchDelegate.kt

@@ -340,6 +340,19 @@ class ChatModelSwitchDelegate(
                         it.copy(modelSwitchConfirmMessage = confirmMessage)
                     }
                 }
+            } else {
+                if (pending != null && pending.sequence == modelSwitchSequence) {
+                    val warning = (map["warning"] as? String)?.trim()
+                    if (!warning.isNullOrBlank()) {
+                        val formattedWarning =
+                            if (warning.startsWith("⚠") || warning.startsWith("⚠️")) {
+                                warning
+                            } else {
+                                "⚠ $warning"
+                            }
+                        addAssistantMessage(formattedWarning)
+                    }
+                }
             }
         } else if (key == "fast") {
             val rawVal = map["value"] as? String

app/src/test/java/com/m57/hermescontrol/ui/chat/ChatModelSwitchDelegateTest.kt

@@ -647,4 +647,95 @@ class ChatModelSwitchDelegateTest {
             delegate.dismissModelSwitchConfirm()
             assertEquals("anthropic/claude-3", uiState.value.currentSessionModel)
         }
+
+    @Test
+    fun handleConfigSetResult_modelWarningWithoutConfirm_addsAssistantMessage() =
+        testScope.runTest {
+            delegate.handleModelSwitch("/model gpt-69-sol --provider openai-codex --session")
+            advanceUntilIdle()
+
+            val warningText =
+                "Note: `gpt-69-sol` was not found in the OpenAI Codex model listing. " +
+                    "Similar models: `gpt-5.6-sol`"
+            delegate.handleConfigSetResult(
+                id = "req-1",
+                result =
+                    mapOf(
+                        "key" to "model",
+                        "value" to "gpt-69-sol",
+                        "confirm_required" to false,
+                        "warning" to warningText,
+                    ),
+            )
+
+            assertEquals(1, assistantMessages.size)
+            assertEquals("⚠ $warningText", assistantMessages.first())
+        }
+
+    @Test
+    fun handleConfigSetResult_modelWarningWithExistingWarningEmoji_doesNotDuplicateEmoji() =
+        testScope.runTest {
+            delegate.handleModelSwitch("/model gpt-69-sol --provider openai-codex --session")
+            advanceUntilIdle()
+
+            val warningText = "⚠ Note: Already prefixed"
+            delegate.handleConfigSetResult(
+                id = "req-1",
+                result =
+                    mapOf(
+                        "key" to "model",
+                        "value" to "gpt-69-sol",
+                        "confirm_required" to false,
+                        "warning" to warningText,
+                    ),
+            )
+
+            assertEquals(listOf(warningText), assistantMessages)
+        }
+
+    @Test
+    fun handleConfigSetResult_staleSequenceWarning_isIgnored() =
+        testScope.runTest {
+            // First switch
+            delegate.handleModelSwitch("/model gpt-4o --provider openai --session")
+            advanceUntilIdle()
+
+            // Second switch supersedes first
+            delegate.handleModelSwitch("/model claude-3-5-sonnet --provider anthropic --session")
+            advanceUntilIdle()
+
+            // First switch response arrives with warning
+            delegate.handleConfigSetResult(
+                id = "req-1",
+                result =
+                    mapOf(
+                        "key" to "model",
+                        "value" to "gpt-4o",
+                        "confirm_required" to false,
+                        "warning" to "Stale warning",
+                    ),
+            )
+
+            assertTrue(assistantMessages.isEmpty())
+        }
+
+    @Test
+    fun handleConfigSetResult_blankWarning_doesNotAddAssistantMessage() =
+        testScope.runTest {
+            delegate.handleModelSwitch("/model gpt-4o --provider openai --session")
+            advanceUntilIdle()
+
+            delegate.handleConfigSetResult(
+                id = "req-1",
+                result =
+                    mapOf(
+                        "key" to "model",
+                        "value" to "gpt-4o",
+                        "confirm_required" to false,
+                        "warning" to "   ",
+                    ),
+            )
+
+            assertTrue(assistantMessages.isEmpty())
+        }
 }

app/src/test/java/com/m57/hermescontrol/ui/kanban/KanbanScopeTest.kt

@@ -38,7 +38,9 @@ class KanbanScopeTest {
             repository = mockRepository,
             preferences = preferences,
             eventsClientProvider = { mockEventsClient },
-        )
+        ).also {
+            it.ioDispatcher = testDispatcher
+        }
 
     @Before
     fun setUp() {