feat(clean-release): complete compliance redesign phases and polish tasks T047-T052

backend/tests/fixtures/clean_release/fixtures_release_v2.json

@@ -0,0 +1,26 @@
+{
+  "candidates": [
+    {
+      "id": "cand_v2_001",
+      "name": "Candidate V2 001",
+      "status": "DRAFT",
+      "created_at": "2026-03-09T12:00:00Z"
+    }
+  ],
+  "manifests": [
+    {
+      "id": "man_v2_001",
+      "candidate_id": "cand_v2_001",
+      "version": 1,
+      "digest": "sha256:abc123def456",
+      "created_at": "2026-03-09T12:05:00Z"
+    }
+  ],
+  "policies": [
+    {
+      "id": "pol_v2_001",
+      "name": "Standard Compliance Policy",
+      "rules": ["data_purity", "internal_sources_only"]
+    }
+  ]
+}