docs(readme): update banner and Kayba positioning

- Banner replaced with the website's current social preview
  (Stop fixing agents by hand)
- Tip box rewritten for the new Kayba product: automated failure
  investigation and fixes as PRs, CTA changed to Get a Demo
- Opening hook positions ACE as the open-source engine powering Kayba
- Star badge switched to standard style and linked to stargazers

Author: halluton

README.md

@@ -1,20 +1,20 @@
-<a href="https://kayba.ai"><img src="assets/kayba-banner.png" alt="Kayba - Make your agents self-improve from experience" width="1080"/></a>
+<a href="https://kayba.ai"><img src="assets/kayba-banner.png" alt="Kayba - Stop fixing agents by hand" width="1080"/></a>
 
 # Agentic Context Engine (ACE)
 
-![GitHub stars](https://img.shields.io/github/stars/kayba-ai/agentic-context-engine?style=social)
+[![GitHub stars](https://img.shields.io/github/stars/kayba-ai/agentic-context-engine)](https://github.com/kayba-ai/agentic-context-engine/stargazers)
 [![Kayba Website](https://img.shields.io/badge/kayba.ai-6B8BA8?style=flat&logo=data:image/png;base64,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&logoColor=white)](https://kayba.ai)
 [![Discord](https://img.shields.io/discord/1429935408145236131?label=Discord&logo=discord&logoColor=white&color=5865F2)](https://discord.gg/mqCqH7sTyK)
 [![Twitter Follow](https://img.shields.io/twitter/follow/kaybaai?style=social)](https://twitter.com/kaybaai)
 [![Documentation](https://img.shields.io/badge/docs-latest-blue.svg)](https://kayba-ai.github.io/agentic-context-engine/latest/)
 
 > [!TIP]
-> ### Try our hosted solution for free at [kayba.ai](https://kayba.ai): automated agent self-improvement from your terminal. CLI + dashboard that analyzes traces, surfaces failures, and ships improvements directly from Claude Code, Codex, and more.
-> [![Kayba Pro](https://img.shields.io/badge/Kayba_Pro-Start_Free_Trial-4A6B80?style=for-the-badge)](https://kayba.ai)
+> ### Want this fully managed? [Kayba](https://kayba.ai) automates the loop: it connects to your error sources, investigates agent failures from traces, and ships fixes as pull requests, with impact tracking after deploy.
+> [![Kayba](https://img.shields.io/badge/Kayba-Get_a_Demo-4A6B80?style=for-the-badge)](https://kayba.ai)
 
 ---
 
-**AI agents don't learn from experience.** They repeat the same mistakes every session, forget what worked, and ignore what failed. ACE adds a persistent learning loop that makes them better over time.
+**AI agents don't learn from experience.** They repeat the same mistakes every session, forget what worked, and ignore what failed. ACE is the open-source engine that adds a persistent learning loop. It also powers [Kayba](https://kayba.ai), the managed service that does this for your production agents automatically.
 
 <img src="examples/seahorse-emoji-ace.gif" alt="ACE learns from mistakes in real time" width="70%"/>