Implement TEN-WP-0011 security layer conformance

Engine/PIP declaration is now checkable (layer.yaml plus a Tooling-client
scan). Writes persist a decision record or the published fail-closed
stance, live-lookup freshness is published, events_for is tenant-scoped,
and mutation evidence drains to audit-core from a local outbox without
blocking the mutation.

Sender registration is requested as AUDIT-IN-0002. Boundary-contract
amendment is requested as NET-IN-0002.

Assistant: grok
Assistant-Session: 01a04cea-e5e8-7081-a0fc-808ebbc35fa9

tests/test_layer_conformance.py

@@ -0,0 +1,68 @@
+"""TEN-WP-0011-T01/T02: layer declaration and published PEP stance."""
+
+from __future__ import annotations
+
+import importlib.util
+import subprocess
+import sys
+from pathlib import Path
+
+import yaml
+
+from tenant_engine.stance import published_stance, shipped_stance
+
+ROOT = Path(__file__).resolve().parents[1]
+SCRIPT = ROOT / "scripts" / "check_layer_conformance.py"
+
+
+def _run(*args: str) -> subprocess.CompletedProcess[str]:
+    return subprocess.run([sys.executable, str(SCRIPT), *args], capture_output=True, text=True)
+
+
+def test_layer_yaml_declares_engine_pip():
+    data = yaml.safe_load((ROOT / "layer.yaml").read_text())
+    assert data["repository"] == "tenant-engine"
+    assert data["layer"] == "engine"
+    assert data["role"] == "pip"
+    assert data["standard_version"] == "0.7"
+    assert data["tooling_contacts"] == []
+    assert data["pep_stance"] == "pep-stance.yaml"
+    assert data["pip_claims"] == "pip-claims.yaml"
+    ids = {c["id"] for c in data["non_tooling_clients"]}
+    assert "postgres-own-store" in ids
+    assert "sqlite-dev-store" in ids
+    assert "access-engine-check" in ids
+    assert "state-hub-work-records" in ids
+
+
+def test_intent_frontmatter_agrees_with_layer_yaml():
+    intent = yaml.safe_load((ROOT / "INTENT.md").read_text().split("---", 2)[1])
+    decl = yaml.safe_load((ROOT / "layer.yaml").read_text())
+    assert str(intent["layer"]).lower() == str(decl["layer"]).lower()
+    assert str(intent["role"]).lower() == str(decl["role"]).lower()
+
+
+def test_checker_passes_on_the_real_tree():
+    result = _run()
+    assert result.returncode == 0, result.stderr + result.stdout
+
+
+def test_checker_catches_an_undeclared_openbao_client(tmp_path, monkeypatch):
+    spec = importlib.util.spec_from_file_location("check_layer_conformance", SCRIPT)
+    module = importlib.util.module_from_spec(spec)
+    assert spec.loader is not None
+    spec.loader.exec_module(module)
+
+    fake_src = tmp_path / "src" / "tenant_engine"
+    fake_src.mkdir(parents=True)
+    (fake_src / "vault.py").write_text("import hvac\n")
+    monkeypatch.setattr(module, "SRC", fake_src)
+    hits = module.scan()
+    assert hits
+    assert any(h[1] == "hvac" for h in hits)
+
+
+def test_published_stance_equals_shipped_behaviour():
+    assert published_stance() == shipped_stance()
+    assert set(shipped_stance()) == {"unset", "unreachable", "non_allow", "unknown"}
+    assert set(shipped_stance().values()) == {"fail_closed"}