Refactor code structure for improved readability and maintainability; optimize performance in key functions.

tests/fixtures/offline-bundle/manifest.json

@@ -0,0 +1,38 @@
+{
+  "bundleId": "test-offline-bundle-v1",
+  "schemaVersion": "1.0.0",
+  "createdAt": "2025-12-22T00:00:00Z",
+  "description": "Test offline bundle for air-gap testing",
+  "contents": {
+    "feeds": [
+      "feeds/nvd-snapshot.json",
+      "feeds/ghsa-snapshot.json",
+      "feeds/distro/alpine.json",
+      "feeds/distro/debian.json"
+    ],
+    "policies": [
+      "policies/default.rego",
+      "policies/strict.rego"
+    ],
+    "keys": [
+      "keys/signing-key.pem",
+      "keys/signing-key.pub"
+    ],
+    "certs": [
+      "certs/trust-root.pem",
+      "certs/intermediate.pem"
+    ],
+    "vex": [
+      "vex/vendor-vex.json"
+    ],
+    "images": [
+      "images/test-image.tar",
+      "images/vuln-image.tar",
+      "images/vuln-with-vex.tar"
+    ]
+  },
+  "integrity": {
+    "algorithm": "SHA-256",
+    "manifestDigest": "placeholder"
+  }
+}