feat(context): Wire OpenAI provider through task context factory and add git-diff support to iterative context builder

ts/aidocs_classes/readme.ts

@@ -18,7 +18,10 @@ export class Readme {
     let finalReadmeString = ``;
 
     // Use the new TaskContextFactory for optimized context
-    const taskContextFactory = new (await import('../context/index.js')).TaskContextFactory(this.projectDir);
+    const taskContextFactory = new (await import('../context/index.js')).TaskContextFactory(
+      this.projectDir,
+      this.aiDocsRef.openaiInstance
+    );
     await taskContextFactory.initialize();
     
     // Generate context specifically for readme task