fix(codeact): preserve formatter diagnostics

Signed-off-by: Paul Furgale <pfurgale@nvidia.com>

Author: furgalep

src/nooa/strategies/codeact.py

@@ -2832,6 +2832,19 @@ def _format_error(
                     },
                 ),
                 ((error, code), {"line_offset": line_offset, "formatted_error": formatted_error}),
+                (
+                    (error, code),
+                    {
+                        "formatted_error": formatted_error,
+                        "max_error": max_error,
+                        "tail_chars": tail_chars,
+                    },
+                ),
+                (
+                    (error, code),
+                    {"formatted_error": formatted_error, "max_error": max_error},
+                ),
+                ((error, code), {"formatted_error": formatted_error}),
                 ((error, code), {"line_offset": line_offset}),
                 ((error, code), {}),
             )

tests/strategies/test_codeact_pure_python_coverage.py

@@ -967,6 +967,22 @@ def format(
 
         assert result == "current[4/321]: Cell In[7], line 1\nValueError: original"
 
+    def test_custom_formatter_without_line_offset_receives_worker_diagnostic(self):
+        class TransportFormatter:
+            def format(self, error, code=None, *, formatted_error=""):
+                return f"transported: {formatted_error}"
+
+        strat = CodeActStrategy(error_formatter=TransportFormatter())
+        result = strat._format_error(
+            ValueError("surrogate"),
+            "bad()",
+            line_offset=4,
+            formatted_error="Cell In[7], line 1\nValueError: original",
+            max_error=321,
+        )
+
+        assert result == "transported: Cell In[7], line 1\nValueError: original"
+
     def test_custom_formatter_without_inspectable_signature_uses_legacy_shape(self, monkeypatch):
         class OpaqueFormatter:
             calls = 0