Summary

• 6.1 — Correct subtitle, intro, What You'll Learn, Solution, and Why This Matters sections to accurately describe OllamaSharp (not Microsoft.Extensions.AI); remove references to IChatClient, AddOllamaChatClient(), and AddAzureOpenAIChatClient() which are not used in the codebase
• 6.3 — Fix AiService.hrInsight() code sample to include the ApiResult<T> wrapper and .pipe(map(r => r.value)) unwrap that the actual implementation uses; add explanation of why only hrInsight needs the envelope unwrap

Test plan

• Verify 6.1 Solution section no longer references Microsoft.Extensions.AI as the abstraction in use
• Verify 6.3 AiService code block matches src/app/services/api/ai.service.ts exactly
• Confirm no other series-6 blogs have inaccurate code samples