🎨 Palette: Improve README architecture diagram and accessibility

[Igor Holt (igor-holt)]

This PR implements micro-UX and accessibility improvements to the README.md, which serves as the primary interface for the Arbiter project.

💡 What

• Architecture Diagram Refinement: Added a title, utilized semantic Mermaid shapes (([ ... ]) for workloads/clusters, {{ ... }} for specialized components), and applied dashed borders to subgraphs to clearly delineate architectural layers.
• Accessibility Enhancements: Added title attributes to external links to provide better context for screen readers and helpful tooltips for all users.
• Contextual Clarity: Included a direct link to the official Genesis Conductor Engine website.

🎯 Why

In infrastructure-heavy projects, the README is the main DX/UX surface. These changes improve cognitive mapping of the system architecture and ensure the documentation follows accessibility best practices.

♿ Accessibility

• Added title="Genesis Conductor Engine - Official Website" to the Genesis link.
• Added title="MIT License - Open source software license agreement" to the license link.
• Improved visual contrast in diagrams using subgraph styling.

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PR created automatically by Jules for task 3883465137718833564 started by Igor Holt (@igor-holt)

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[gemini-code-assist]

Code Review

This pull request updates the README.md file, enhancing the Mermaid architecture diagram with a title, new nodes (AI Workloads and VRAM Pinning), updated connections, and styled subgraphs. It also adds descriptive hyperlinks to the Context and License sections. Feedback suggests improving the diagram's accessibility by utilizing Mermaid's native accTitle and accDescr properties.

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[gemini-code-assist]

Since this pull request specifically focuses on improving accessibility, you can leverage Mermaid's native support for accessibility properties (accTitle and accDescr). This allows screen readers to describe the diagram to visually impaired users.

Suggested change

	graph TD
	graph TD
	accTitle: Arbiter Hybrid Scheduling Architecture
	accDescr: Flowchart illustrating the Arbiter Hybrid Scheduling Architecture, showing how AI Workloads and Kubernetes in the Cloud Native Layer connect to the Arbiter Core and Quantum Scheduler in the Orchestration Layer, which in turn manage VRAM Pinning, Bare Metal Hardware, and GPU Resources in the Infrastructure Layer.