Fix type errors from main branch merge

The main branch code attempted to pass clientUserAgent to DirectContext.create/import
and AugmentLanguageModel, but these APIs don't accept that parameter.

Changes:
- Removed clientUserAgent from DirectContext.create() call in indexer.ts
- Removed clientUserAgent from DirectContext.import() calls in indexer.ts and search-client.ts
- Removed clientUserAgent from AugmentLanguageModel config in cli-agent.ts

The clientUserAgent is still stored in SearchClient and Indexer for future use,
but is not passed to APIs that don't support it.

Author: richhankins

src/clients/cli-agent.ts

@@ -192,7 +192,6 @@ async function loadModel(
       return new AugmentLanguageModel(modelName, {
         apiKey: credentials.apiKey,
         apiUrl: credentials.apiUrl,
-        clientUserAgent,
       }) as unknown as LanguageModel;
     }
     default:

src/clients/search-client.ts

@@ -169,7 +169,6 @@ export class SearchClient {
     this.context = await DirectContext.import(this.state.contextState, {
       apiKey: this.apiKey,
       apiUrl: this.apiUrl,
-      clientUserAgent: this.clientUserAgent,
     });
   }
 

src/core/indexer.ts

@@ -198,7 +198,6 @@ export class Indexer {
     const context = await DirectContext.create({
       apiKey: this.apiKey,
       apiUrl: this.apiUrl,
-      clientUserAgent: this.clientUserAgent,
     });
 
     // Fetch all files from source
@@ -262,7 +261,6 @@ export class Indexer {
     const context = await DirectContext.import(previousState.contextState, {
       apiKey: this.apiKey,
       apiUrl: this.apiUrl,
-      clientUserAgent: this.clientUserAgent,
     });
 
     // Remove deleted files