test: add golden render for all formats

tests/fixtures/codex_exec_json_all_formats.txt

@@ -0,0 +1,32 @@
+stream error: Failed to load optional config file ~/.codex/local.toml (ENOENT); continuing with defaults
+thread started
+turn started
+2. ✓ searched: python jsonlines parser handle unknown fields
+stream error: Web search disabled by policy; returned cached results only
+3. ▸ tool: github.search_issues
+3. ✓ tool: github.search_issues
+4. ▸ `pytest -q`
+4. ✗ `pytest -q` (exit 1)
+5. ✓ updated `src/compute_answer.py`, `tests/test_beta.py`
+6. ▸ `pytest -q`
+6. ✓ `pytest -q`
+7. Root cause: compute_answer() returned 0. Updated logic to return 42 for the valid input path. Re-ran pytest to confirm all tests pass.
+assistant:
+  I found the failing assertion in tests/test_beta.py and updated src/compute_answer.py to return the expected value (42). After the change, `pytest -q` reports 12 passed.
+turn completed
+turn started
+9. ▸ `npm test`
+9. ✗ `npm test` (exit 127)
+10. ✓ warning: Command `npm` not found in PATH (exit 127).
+turn failed: Aborted: required dependency `npm` is missing; cannot continue.
+stream error: codex exec exited non-zero (1) after turn.failed
+thread started
+turn started
+assistant:
+  Legacy schema example: hello (item_type=assistant_message).
+2. ✓ `echo legacy`
+turn completed
+thread started
+turn started
+2. ✓ updated `README.md`
+turn completed

tests/test_exec_render.py

@@ -11,7 +11,10 @@ def _loads(lines: str) -> list[dict]:
 
 FIXTURE_PATH = Path(__file__).resolve().parent / "fixtures" / "codex.jsonl"
 ALL_FORMATS_FIXTURE_PATH = (
-    Path(__file__).resolve().parent.parent / "codex_exec_json_all_formats.jsonl"
+    Path(__file__).resolve().parent / "fixtures" / "codex_exec_json_all_formats.jsonl"
+)
+ALL_FORMATS_GOLDEN_PATH = (
+    Path(__file__).resolve().parent / "fixtures" / "codex_exec_json_all_formats.txt"
 )
 
 SAMPLE_STREAM = """
@@ -91,6 +94,18 @@ def test_render_event_cli_all_formats_fixture() -> None:
     assert any("Legacy schema example" in line for line in out)
 
 
+def test_render_event_cli_all_formats_golden() -> None:
+    events = _loads(ALL_FORMATS_FIXTURE_PATH.read_text(encoding="utf-8"))
+    last_turn = None
+    out: list[str] = []
+    for evt in events:
+        last_turn, lines = render_event_cli(evt, last_turn)
+        out.extend(lines)
+
+    expected = ALL_FORMATS_GOLDEN_PATH.read_text(encoding="utf-8").rstrip("\n")
+    assert "\n".join(out) == expected
+
+
 def test_progress_renderer_renders_progress_and_final() -> None:
     r = ExecProgressRenderer(max_actions=5)
     for evt in _loads(SAMPLE_STREAM):