Fix: Make main_pm + task_type=code impossible

tests/unit/foundation/policy/content/test_content_models.py

@@ -206,6 +206,49 @@ def test_findings_single_dict_coerced_to_list() -> None:
     assert len(c.findings) == 1
 
 
+def test_pr_review_issues_carry_free_text_change_requests() -> None:
+    # The in-path gate fails on free-text issues (not structured Finding
+    # objects, which require file/severity/expected/actual). Those issues now
+    # land in the additive `issues` slot instead of being flattened into the
+    # summary string alone — so a reader of notes_structured.pr_review gets the
+    # concrete change-requests, and the rendered TEXT mirror gains an Issues
+    # section.
+    c = validate_content(
+        "pr_review",
+        {
+            "summary": "PR review needs changes before this can merge.",
+            "verdict": "changes_requested",
+            "issues": ["seam mismatch on the rebase path", "docs lag the diff"],
+        },
+    )
+    assert isinstance(c, PrReviewContent)
+    assert c.issues == ["seam mismatch on the rebase path", "docs lag the diff"]
+    rendered = c.render_markdown()
+    assert "## Issues" in rendered
+    assert "seam mismatch on the rebase path" in rendered
+    assert "docs lag the diff" in rendered
+
+
+def test_pr_review_issues_default_empty_and_single_scalar_coerced() -> None:
+    c = validate_content(
+        "pr_review",
+        {"summary": "Clean PR, no free-text issues to raise.", "verdict": "approved"},
+    )
+    assert isinstance(c, PrReviewContent)
+    assert c.issues == []
+    assert "## Issues" not in c.render_markdown()
+
+    coerced = validate_content(
+        "pr_review",
+        {
+            "summary": "One free-text issue passed as a bare string here.",
+            "verdict": "changes_requested",
+            "issues": "lone issue string",
+        },
+    )
+    assert coerced.issues == ["lone issue string"]
+
+
 def test_where_to_look_single_string_coerced() -> None:
     c = validate_content(
         "resumption",

tests/unit/foundation/policy/test_batch.py

@@ -10,7 +10,9 @@ from roboco.foundation.policy.batch import (
     is_batch_umbrella,
     is_branchless_coordination,
     is_valid_batch_shape,
+    main_pm_cannot_own_code,
 )
+from roboco.models.base import TaskType, Team
 
 
 def test_umbrella_is_batch_id_set_and_top_level() -> None:
@@ -163,3 +165,27 @@ def test_valid_batch_shape_denies_cell_map_alongside_another_target() -> None:
         product_id=uuid4(),
         has_cell_projects=True,
     )
+
+
+def test_main_pm_cannot_own_code_predicate() -> None:
+    """``main_pm`` + ``code`` must never coexist — the single invariant behind
+    the intake coercion, the create backstop, the reassign/escalation diversion,
+    and the claim guard. Accepts ORM enums or their .value strings."""
+    # The forbidden combo, in both enum and string form.
+    assert main_pm_cannot_own_code(team=Team.MAIN_PM, task_type=TaskType.CODE)
+    assert main_pm_cannot_own_code(
+        team=Team.MAIN_PM.value, task_type=TaskType.CODE.value
+    )
+    # A Main PM coordinating (planning / research / etc.) is fine.
+    assert not main_pm_cannot_own_code(team=Team.MAIN_PM, task_type=TaskType.PLANNING)
+    assert not main_pm_cannot_own_code(team=Team.MAIN_PM, task_type=TaskType.RESEARCH)
+    assert not main_pm_cannot_own_code(
+        team=Team.MAIN_PM, task_type=TaskType.DOCUMENTATION
+    )
+    # Code owned by any non-main_pm team (a cell dev, the board pre-approval) is fine.
+    assert not main_pm_cannot_own_code(team=Team.BACKEND, task_type=TaskType.CODE)
+    assert not main_pm_cannot_own_code(team=Team.FRONTEND, task_type=TaskType.CODE)
+    assert not main_pm_cannot_own_code(team=Team.BOARD, task_type=TaskType.CODE)
+    # Missing team or type cannot satisfy the invariant.
+    assert not main_pm_cannot_own_code(team=None, task_type=TaskType.CODE)
+    assert not main_pm_cannot_own_code(team=Team.MAIN_PM, task_type=None)