Add call graph fixtures for various languages and scenarios

- Introduced `all-edge-reasons.json` to test edge resolution reasons in .NET.
- Added `all-visibility-levels.json` to validate method visibility levels in .NET.
- Created `dotnet-aspnetcore-minimal.json` for a minimal ASP.NET Core application.
- Included `go-gin-api.json` for a Go Gin API application structure.
- Added `java-spring-boot.json` for the Spring PetClinic application in Java.
- Introduced `legacy-no-schema.json` for legacy application structure without schema.
- Created `node-express-api.json` for an Express.js API application structure.

src/Scanner/docs/schemas/scanner-offline-kit-config.schema.json

@@ -0,0 +1,83 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "https://stella-ops.org/schemas/scanner-offline-kit-config.schema.json",
+  "title": "Scanner Offline Kit Configuration",
+  "type": "object",
+  "description": "Schema for the `scanner.offlineKit` configuration section used by Scanner WebService/Worker for offline kit verification.",
+  "properties": {
+    "enabled": {
+      "type": "boolean",
+      "default": false,
+      "description": "Enable offline kit operations (opt-in)."
+    },
+    "requireDsse": {
+      "type": "boolean",
+      "default": true,
+      "description": "Fail import if DSSE verification fails."
+    },
+    "rekorOfflineMode": {
+      "type": "boolean",
+      "default": true,
+      "description": "Use only local Rekor snapshots; do not call online Rekor APIs."
+    },
+    "attestationVerifier": {
+      "type": "string",
+      "format": "uri",
+      "description": "URL of internal attestation verifier service."
+    },
+    "trustRootDirectory": {
+      "type": "string",
+      "description": "Path to directory containing trust root public keys."
+    },
+    "rekorSnapshotDirectory": {
+      "type": "string",
+      "description": "Path to Rekor snapshot directory."
+    },
+    "trustAnchors": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": [
+          "anchorId",
+          "purlPattern",
+          "allowedKeyids"
+        ],
+        "properties": {
+          "anchorId": {
+            "type": "string",
+            "minLength": 1
+          },
+          "purlPattern": {
+            "type": "string",
+            "minLength": 1,
+            "examples": [
+              "pkg:npm/*",
+              "pkg:maven/org.apache.*",
+              "*"
+            ]
+          },
+          "allowedKeyids": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "minItems": 1
+          },
+          "description": {
+            "type": "string"
+          },
+          "expiresAt": {
+            "type": "string",
+            "format": "date-time"
+          },
+          "minSignatures": {
+            "type": "integer",
+            "minimum": 1,
+            "default": 1
+          }
+        }
+      }
+    }
+  }
+}
+