feat: Document completed tasks across multiple components

- Added completed tasks documentation for Scheduler WebService, ImpactIndex, Models, Queue, Storage.Mongo, Worker, Signals, Signer, UI, Zastava.Observer, Zastava.Webhook, Zastava.Core, Cryptography.Kms, Cryptography, and Plugin.
- Each task includes ID, status, owners, dependencies, descriptions, and exit criteria to ensure clarity and traceability.
- Enhanced integration and unit testing coverage across various components to validate functionality and compliance with specifications.

docs/events/scanner.event.report.ready@1.json

@@ -122,16 +122,15 @@
           "type": "object",
           "description": "Policy revision metadata surfaced alongside the report."
         },
-        "links": {
-          "type": "object",
-          "additionalProperties": false,
-          "properties": {
-            "ui": {"type": "string", "format": "uri"},
-            "report": {"type": "string", "format": "uri"},
-            "policy": {"type": "string", "format": "uri"},
-            "attestation": {"type": "string", "format": "uri"}
-          }
-        },
+        "links": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "report": {"$ref": "#/definitions/linkTarget"},
+            "policy": {"$ref": "#/definitions/linkTarget"},
+            "attestation": {"$ref": "#/definitions/linkTarget"}
+          }
+        },
         "dsse": {
           "type": "object",
           "additionalProperties": false,
@@ -161,4 +160,14 @@
       }
     }
   }
-}
+  "definitions": {
+    "linkTarget": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "ui": {"type": "string", "format": "uri"},
+        "api": {"type": "string", "format": "uri"}
+      }
+    }
+  }
+}