Preserve discarded patch context

tests/test_worker.py

@@ -158,6 +158,7 @@ def test_php_syntax_failure_discards_attempt_before_full_validation() -> None:
         Mock(returncode=0, stdout="No syntax errors", stderr=""),
         Mock(returncode=0, stdout="No syntax errors", stderr=""),
     ]
+    workspace.diff.return_value = "--- app/Service.php\n+++ app/Service.php\n+intended fix"
     workspace.checkpoint.return_value = "valid-checkpoint"
     workspace.commit.return_value = "commit-id"
 
@@ -167,6 +168,7 @@ def test_php_syntax_failure_discards_attempt_before_full_validation() -> None:
     assert worker.agent.run.call_count == 2
     assert "unexpected token" in worker.agent.run.call_args_list[1].args[1]
     assert "clean repository" in worker.agent.run.call_args_list[1].args[1]
+    assert "intended fix" in worker.agent.run.call_args_list[1].args[1]
     workspace.restore_checkpoint.assert_called_once_with(None)
     worker._run_tests.assert_called_once()
 
@@ -207,6 +209,7 @@ def test_malformed_retry_restores_last_syntax_valid_attempt() -> None:
         Mock(returncode=0, stdout="No syntax errors", stderr=""),
         Mock(returncode=0, stdout="No syntax errors", stderr=""),
     ]
+    workspace.diff.return_value = "--- app/Service.php\n+++ app/Service.php\n+application repair"
     workspace.checkpoint.side_effect = ["checkpoint-1", "checkpoint-3"]
     workspace.commit.return_value = "commit-id"
 
@@ -216,6 +219,7 @@ def test_malformed_retry_restores_last_syntax_valid_attempt() -> None:
     assert worker.agent.run.call_count == 3
     workspace.restore_checkpoint.assert_called_once_with("checkpoint-1")
     assert "last syntax-valid changes were restored" in worker.agent.run.call_args_list[2].args[1]
+    assert "application repair" in worker.agent.run.call_args_list[2].args[1]
     assert worker._run_tests.call_count == 2