Add project registration policy and template

tests/test_project_registry.py

@@ -5,6 +5,7 @@ import json
 import atocore.config as config
 from atocore.projects.registry import (
     get_registered_project,
+    get_project_registry_template,
     list_registered_projects,
     refresh_registered_project,
 )
@@ -150,3 +151,60 @@ def test_refresh_registered_project_ingests_registered_roots(tmp_path, monkeypat
     assert calls[0][0].endswith("p06-polisher")
     assert calls[0][1] is False
     assert result["roots"][0]["status"] == "ingested"
+
+
+def test_project_registry_template_has_expected_shape():
+    template = get_project_registry_template()
+    assert "projects" in template
+    assert template["projects"][0]["id"] == "p07-example"
+    assert template["projects"][0]["ingest_roots"][0]["source"] == "vault"
+
+
+def test_project_registry_rejects_alias_collision(tmp_path, monkeypatch):
+    vault_dir = tmp_path / "vault"
+    drive_dir = tmp_path / "drive"
+    config_dir = tmp_path / "config"
+    vault_dir.mkdir()
+    drive_dir.mkdir()
+    config_dir.mkdir()
+
+    registry_path = config_dir / "project-registry.json"
+    registry_path.write_text(
+        json.dumps(
+            {
+                "projects": [
+                    {
+                        "id": "p04-gigabit",
+                        "aliases": ["shared"],
+                        "ingest_roots": [
+                            {"source": "vault", "subpath": "incoming/projects/p04-gigabit"}
+                        ],
+                    },
+                    {
+                        "id": "p05-interferometer",
+                        "aliases": ["shared"],
+                        "ingest_roots": [
+                            {"source": "vault", "subpath": "incoming/projects/p05-interferometer"}
+                        ],
+                    },
+                ]
+            }
+        ),
+        encoding="utf-8",
+    )
+
+    monkeypatch.setenv("ATOCORE_VAULT_SOURCE_DIR", str(vault_dir))
+    monkeypatch.setenv("ATOCORE_DRIVE_SOURCE_DIR", str(drive_dir))
+    monkeypatch.setenv("ATOCORE_PROJECT_REGISTRY_PATH", str(registry_path))
+
+    original_settings = config.settings
+    try:
+        config.settings = config.Settings()
+        try:
+            list_registered_projects()
+        except ValueError as exc:
+            assert "collision" in str(exc)
+        else:
+            raise AssertionError("Expected project registry collision to raise")
+    finally:
+        config.settings = original_settings