Harden release source execution

tests/test_release_source_provenance.py

@@ -23,6 +23,7 @@ from govoplan_release.catalog import canonical_hash  # noqa: E402
 from govoplan_release.selective_catalog import (  # noqa: E402
     build_selective_catalog_candidate,
     enforce_selected_source_provenance,
+    parse_signing_key,
     public_key_base64,
     signature,
 )
@@ -159,6 +160,7 @@ class ReleaseSourceProvenanceTests(unittest.TestCase):
                 encryption_algorithm=serialization.NoEncryption(),
             )
         )
+        key_path.chmod(0o600)
         output = self.root / "candidate"
 
         with patch(
@@ -181,6 +183,25 @@ class ReleaseSourceProvenanceTests(unittest.TestCase):
         self.assertEqual(git_text(core, "rev-parse", "refs/tags/v1.2.3"), selected["tag_object_sha"])
         self.assertEqual("test-key", payload["signatures"][0]["key_id"])
 
+    def test_catalog_signing_key_must_be_operator_private(self) -> None:
+        private_key = Ed25519PrivateKey.generate()
+        key_path = self.root / "release.pem"
+        key_path.write_bytes(
+            private_key.private_bytes(
+                encoding=serialization.Encoding.PEM,
+                format=serialization.PrivateFormat.PKCS8,
+                encryption_algorithm=serialization.NoEncryption(),
+            )
+        )
+        key_path.chmod(0o644)
+
+        with self.assertRaisesRegex(ValueError, "inaccessible to other users"):
+            parse_signing_key(f"test-key={key_path}")
+
+        key_path.chmod(0o600)
+        key_id, _parsed = parse_signing_key(f"test-key={key_path}")
+        self.assertEqual("test-key", key_id)
+
     def test_catalog_publication_checks_every_preserved_source_ref(self) -> None:
         core, _ = make_repo(self.workspace, self.root, "govoplan-core", "1.2.3")
         git(core, "tag", "-a", "v1.2.3", "-m", "Core 1.2.3")
@@ -235,22 +256,21 @@ class ReleaseSourceProvenanceTests(unittest.TestCase):
         self.assertIn("Array.isArray(result.notes)", ui)
         self.assertIn("Validation and provenance details", ui)
 
-    def test_console_returns_actionable_conflict_for_candidate_provenance_gate(self) -> None:
-        with patch(
-            "server.app.build_selective_catalog_candidate",
-            side_effect=ValueError("Complete catalog source provenance gate failed: govoplan-core v1.2.3: missing"),
-        ):
-            with TestClient(create_app(workspace_root=self.workspace)) as client:
-                response = client.post(
-                    "/api/catalog-candidates",
-                    json={
-                        "repo_versions": {"govoplan-core": "1.2.3"},
-                        "signing_keys": ["test=/unused/key.pem"],
-                    },
-                )
+    def test_console_disables_unclaimed_legacy_candidate_signing(self) -> None:
+        with TestClient(
+            create_app(workspace_root=self.workspace, token="token")
+        ) as client:
+            response = client.post(
+                "/api/catalog-candidates",
+                headers={"X-Release-Console-Token": "token"},
+                json={
+                    "repo_versions": {"govoplan-core": "1.2.3"},
+                    "signing_keys": ["test=/unused/key.pem"],
+                },
+            )
 
         self.assertEqual(409, response.status_code)
-        self.assertIn("govoplan-core v1.2.3: missing", response.json()["detail"])
+        self.assertIn("durable release run", response.json()["detail"])
 
     def test_read_only_ref_checks_can_reuse_the_same_gitea_https_endpoint(self) -> None:
         self.assertEqual(