Add Response ctor overload, agent Ids, and metadata fields

- Added a new Response constructor overload for simpler instantiation with conversationId, streamState, and optional tokenUsageResponse.
- Updated AddAIAgent registrations for "ReformulationAgent" and "RagAgent" to set Id to the lower-cased key.
- Modified VectorSearchService to use the new Response constructor, omitting now-optional parameters.
- Enhanced ContextProvider: TextSearchResult now includes a RawRepresentation property with chunk metadata (Id, DocumentId, PageNumber, IndexOnPage, Content).

SqlDatabaseVectorSearch/Models/Response.cs

@@ -7,4 +7,9 @@ public record class Response(Guid ConversationId, string? OriginalQuestion, stri
         : this(conversationId, null, null, token, streamState, tokenUsageResponse)
     {
     }
+
+    public Response(Guid conversationId, StreamState streamState, TokenUsageResponse? tokenUsageResponse = null)
+    : this(conversationId, null, null, null, streamState, tokenUsageResponse)
+    {
+    }
 }

SqlDatabaseVectorSearch/Program.cs

@@ -117,6 +117,7 @@ builder.Services.AddAIAgent("ReformulationAgent", (services, key) =>
 
     return chatClient.AsAIAgent(new ChatClientAgentOptions()
     {
+        Id = key.ToLowerInvariant(),
         Name = key,
         ChatOptions = new()
         {
@@ -209,6 +210,7 @@ builder.Services.AddAIAgent("RagAgent", (services, key) =>
 
     return chatClient.AsAIAgent(new ChatClientAgentOptions
     {
+        Id = key.ToLowerInvariant(),
         Name = key,
         ChatOptions = new()
         {

SqlDatabaseVectorSearch/Services/VectorSearchService.cs

@@ -84,7 +84,7 @@ public partial class VectorSearchService([FromKeyedServices("EmbeddingWorkflow")
         await sessionStore.SaveSessionAsync(ragAgent, question.ConversationId.ToString(), session, cancellationToken);
         var response = updates.ToAgentResponse();
 
-        yield return new(question.ConversationId, null, null, response.Text, StreamState.End, new TokenUsageResponse(null, response.Usage));
+        yield return new(question.ConversationId, StreamState.End, new TokenUsageResponse(null, response.Usage));
     }
 }
 
@@ -105,6 +105,7 @@ public class ContextProvider(ApplicationDbContext dbContext, IEmbeddingGenerator
                         SourceLink = c.Id.ToString().ToLowerInvariant(),
                         SourceName = c.Document.Name,
                         Text = c.Content,
+                        RawRepresentation = new { c.Id, c.DocumentId, c.PageNumber, c.IndexOnPage, c.Content }
                     })
                     .ToListAsync(cancellationToken);