feat(agent): harden loop recovery and permission hook lifecycle

src/AxCopilot.Tests/Services/AgentLoopCodeQualityTests.cs

@@ -1864,6 +1864,42 @@ public class AgentLoopCodeQualityTests
         delay2.Should().BeLessThan(1850);
     }
 
+    [Fact]
+    public void IsContextOverflowError_DetectsMaxOutputTokenPatterns()
+    {
+        var maxOutput = InvokePrivateStatic<bool>(
+            "IsContextOverflowError",
+            "Request failed: maximum output tokens exceeded");
+        var truncated = InvokePrivateStatic<bool>(
+            "IsContextOverflowError",
+            "response was truncated due to token limit");
+        var unrelated = InvokePrivateStatic<bool>(
+            "IsContextOverflowError",
+            "invalid api key");
+
+        maxOutput.Should().BeTrue();
+        truncated.Should().BeTrue();
+        unrelated.Should().BeFalse();
+    }
+
+    [Fact]
+    public void IsLikelyWithheldOrOverflowResponse_DetectsWithheldAndLimitHints()
+    {
+        var withheld = InvokePrivateStatic<bool>(
+            "IsLikelyWithheldOrOverflowResponse",
+            "output withheld because prompt too long");
+        var maxOutput = InvokePrivateStatic<bool>(
+            "IsLikelyWithheldOrOverflowResponse",
+            "max_output_tokens reached");
+        var normal = InvokePrivateStatic<bool>(
+            "IsLikelyWithheldOrOverflowResponse",
+            "completed successfully");
+
+        withheld.Should().BeTrue();
+        maxOutput.Should().BeTrue();
+        normal.Should().BeFalse();
+    }
+
     [Fact]
     public void GetToolExecutionTimeoutMs_UsesDefaultWhenEnvMissing()
     {