Refactor code structure for improved readability and maintainability; removed redundant code blocks and optimized function calls.

docs/policy/fixtures/policy-auth-signal-reachability.json

@@ -0,0 +1,31 @@
+{
+  "id": "ulid-01J000REACH000000000000000",
+  "tenant": "urn:tenant:demo",
+  "subject": "service://demo-api",
+  "signal_type": "reachability",
+  "source": "signals",
+  "evidence": [
+    {
+      "kind": "runtime",
+      "uri": "cas://runtime-facts/123",
+      "digest": "sha256:cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc"
+    },
+    {
+      "kind": "attestation",
+      "uri": "cas://attestations/abc",
+      "digest": "sha256:dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"
+    }
+  ],
+  "provenance": {
+    "pipeline": "build:reachability-001",
+    "inputs": [
+      "sha256:eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee"
+    ],
+    "signer": "sigkey:runtime",
+    "transparency": {
+      "rekor_uuid": "a1b2c3d4",
+      "skip_reason": null
+    }
+  },
+  "created": "2025-11-19T12:00:00Z"
+}