fix: reconcile main-merge — actors.user schema + stderr-only console

Three merge-integration fixes surfaced when running the full suite
against the consolidated feat/terminal-dx branch:

- `tolokaforge/core/dry_run.py` — use `task.resolve_user_simulator()`
  instead of the removed `task.user_simulator` attribute (main's M9
  project-layer work moved the field to `actors.user`).
- `tests/unit/test_dry_run.py` — same rename in the corresponding
  assertion.
- `tests/unit/dx/test_cli_assets.py::test_directory_seed_stamped_and_check_passes`
  — assert on `result.stderr` (not `result.output`); the terminal-dx
  branch already routes progress output to stderr per PR #280's
  "stdout is artifact, stderr is progress" contract, but the merge
  picked up main's stdout-based assertions on this test path.

Author: CiroGamboa

tests/unit/dx/test_cli_assets.py

@@ -156,14 +156,14 @@ def test_directory_seed_stamped_and_check_passes(
         )
 
         result = runner.invoke(cli, ["assets", "stamp", str(tmp_path)])
-        assert result.exit_code == 0, result.output
-        assert "wrote 1 digest" in result.output
+        assert result.exit_code == 0, result.stderr
+        assert "wrote 1 digest" in result.stderr
         entry = yaml.safe_load(project_yaml.read_text())["assets"]["seeds"]["src"]
         assert entry["digest"] == expected
 
         check = runner.invoke(cli, ["assets", "stamp", "--check", str(tmp_path)])
-        assert check.exit_code == 0, check.output
-        assert "match" in check.output
+        assert check.exit_code == 0, check.stderr
+        assert "match" in check.stderr
 
     def test_bare_string_shorthand_coerced_to_dict_with_digest(
         self, runner: CliRunner, tmp_path: Path

tests/unit/test_dry_run.py

@@ -112,10 +112,11 @@ def test_materialize_placeholder_when_no_initial_user_message(self) -> None:
             runtime_choice="shared",
         )
 
+        sim = task.resolve_user_simulator()
         assert sample.user_prompt_is_literal is False
         assert "generated at runtime by user simulator" in sample.user_prompt_text
-        assert f"mode={task.user_simulator.mode}" in sample.user_prompt_text
-        assert f"persona={task.user_simulator.persona}" in sample.user_prompt_text
+        assert f"mode={sim.mode}" in sample.user_prompt_text
+        assert f"persona={sim.persona}" in sample.user_prompt_text
 
     def test_materialize_no_http_via_respx(self, monkeypatch: pytest.MonkeyPatch) -> None:
         """No socket opens. Belt-and-braces: patch httpx.Client.send AND

tolokaforge/core/dry_run.py

@@ -86,7 +86,7 @@ def _placeholder_user_prompt(task: TaskConfig) -> str:
     operator sees what the user simulator would generate at runtime
     without firing the simulator's LLM call.
     """
-    sim = task.user_simulator
+    sim = task.resolve_user_simulator()
     backstory = sim.backstory or ""
     truncated = backstory[:120]
     suffix = "…" if len(backstory) > 120 else ""