chore: import upstream snapshot with attribution

tests/interactive_shell/runtime/test_agent_presentation.py

@@ -0,0 +1,51 @@
+"""The turn-error render adds ``/model`` and ``/auth login`` recovery hints on a credit-exhausted error."""
+
+from __future__ import annotations
+
+import asyncio
+from unittest.mock import MagicMock
+
+from core.llm.shared.llm_retry import LLMCreditExhaustedError
+from surfaces.interactive_shell.runtime.agent_presentation import (
+    AgentEvent,
+    AgentPresentationState,
+    _render_agent_presentation_transition,
+)
+
+
+class _RecordingConsole:
+    def __init__(self) -> None:
+        self.lines: list[str] = []
+
+    def print(self, text: str = "") -> None:
+        self.lines.append(text)
+
+
+def _render_turn_error(error: Exception) -> str:
+    console = _RecordingConsole()
+    asyncio.run(
+        _render_agent_presentation_transition(
+            previous=AgentPresentationState(),
+            current=AgentPresentationState(),
+            event=AgentEvent(type="turn_error", error=error),
+            console=console,  # type: ignore[arg-type]
+            spinner=MagicMock(),
+        )
+    )
+    return "\n".join(console.lines)
+
+
+def test_credit_exhausted_turn_error_shows_model_hint() -> None:
+    output = _render_turn_error(LLMCreditExhaustedError("Anthropic credit exhausted"))
+    assert "/model" in output
+
+
+def test_credit_exhausted_turn_error_shows_auth_login_hint() -> None:
+    output = _render_turn_error(LLMCreditExhaustedError("Anthropic credit exhausted"))
+    assert "/auth login" in output
+
+
+def test_other_turn_error_has_no_model_hint() -> None:
+    output = _render_turn_error(RuntimeError("something else broke"))
+    assert "/model" not in output
+    assert "/auth login" not in output