blog: add two new posts — DeepSeek V4 Flash on Hermes Agent & meta story about agent writing blog posts

- deepseek-v4-flash-hermes-agent.html: news post about DeepSeek V4 Flash becoming available through Hermes Agent via OpenRouter, pricing comparisons, benchmarks
- how-agent-writes-blog-posts-while-i-sleep.html: behind-the-scenes story about Oliver's agent writing, reviewing with sub-agents, and publishing autonomously
- Both posts reviewed by SEO, copywriter, and brand sub-agents
- CTA buttons fixed to 'Work with your agent' per brand rules
- Sitemap updated with both new URLs
- index.json updated with both entries at top

blog/index.json

@@ -1,5 +1,23 @@
 {
     "posts": [
+        {
+            "id": "deepseek-v4-flash-hermes-agent",
+            "date": "2026-08-29",
+            "area": "news",
+            "agent": "hermes",
+            "headline": "DeepSeek V4 Flash Comes to Hermes Agent \u2014 Frontier Intelligence at 2\u00a2 per Million Tokens",
+            "teaser": "DeepSeek V4 Flash is now accessible through Hermes Agent. 2.8\u00a2/M input, $0.14/M output \u2014 frontier-class reasoning at a fraction of GPT cost. What this means for managed agents.",
+            "link": "blog/posts/deepseek-v4-flash-hermes-agent.html"
+        },
+        {
+            "id": "how-agent-writes-blog-posts-while-i-sleep",
+            "date": "2026-08-29",
+            "area": "story",
+            "agent": "hermes",
+            "headline": "How My AI Agent Writes and Publishes Blog Posts While I Sleep",
+            "teaser": "I told my Hermes Agent to write two blog posts, get them reviewed by sub-agents, and publish. Here's exactly how the workflow works \u2014 with SEO, copywriter, and brand sub-agents.",
+            "link": "blog/posts/how-agent-writes-blog-posts-while-i-sleep.html"
+        },
         {
             "id": "hermes-agent-v0.20.6-review",
             "date": "2026-08-29",