Enhance risk API documentation and error handling

- Updated API documentation for risk endpoints to include optional caching headers and error catalog references.
- Added a new error catalog JSON file to standardize error responses.
- Improved explainability documentation with sample outputs for console and CLI.
- Added SHA256 checksums for new sample files related to explainability.
- Refined AocGuard tests to utilize a helper method for generating test JSON, improving readability and maintainability.
- Updated runbook references to ensure consistency in sprint documentation.
- Introduced stub implementations for MongoDB storage interfaces and options, laying groundwork for future development.
- Disabled analytics in Angular CLI configuration for privacy considerations.

src/Concelier/__Libraries/StellaOps.Concelier.Storage.Mongo/Documents/DocumentRecord.cs

@@ -0,0 +1,11 @@
+namespace StellaOps.Concelier.Storage.Mongo.Documents;
+
+/// <summary>
+/// Stub record for document storage. (Placeholder for full implementation)
+/// </summary>
+public sealed record DocumentRecord
+{
+    public string Id { get; init; } = string.Empty;
+    public string TenantId { get; init; } = string.Empty;
+    public string Source { get; init; } = string.Empty;
+}

src/Concelier/__Libraries/StellaOps.Concelier.Storage.Mongo/IDocumentStore.cs

@@ -0,0 +1,8 @@
+namespace StellaOps.Concelier.Storage.Mongo;
+
+/// <summary>
+/// Stub interface for document storage. (Placeholder for full implementation)
+/// </summary>
+public interface IDocumentStore
+{
+}

src/Concelier/__Libraries/StellaOps.Concelier.Storage.Mongo/ISourceStateRepository.cs

@@ -0,0 +1,8 @@
+namespace StellaOps.Concelier.Storage.Mongo;
+
+/// <summary>
+/// Stub interface for source state repository. (Placeholder for full implementation)
+/// </summary>
+public interface ISourceStateRepository
+{
+}

src/Concelier/__Libraries/StellaOps.Concelier.Storage.Mongo/MongoStorageOptions.cs

@@ -0,0 +1,10 @@
+namespace StellaOps.Concelier.Storage.Mongo;
+
+/// <summary>
+/// Stub options for MongoDB storage. (Placeholder for full implementation)
+/// </summary>
+public sealed class MongoStorageOptions
+{
+    public string ConnectionString { get; set; } = string.Empty;
+    public string DatabaseName { get; set; } = string.Empty;
+}

src/Concelier/__Libraries/StellaOps.Concelier.Storage.Mongo/StellaOps.Concelier.Storage.Mongo.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <LangVersion>preview</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="../StellaOps.Concelier.RawModels/StellaOps.Concelier.RawModels.csproj" />
+    <ProjectReference Include="../StellaOps.Concelier.Models/StellaOps.Concelier.Models.csproj" />
+  </ItemGroup>
+</Project>