Reframe README around shared organizational memory

[sparkplug604]

This PR rewrites the main README to make Praxis easier to understand for new readers. It shifts the opening from technical infrastructure language to a clearer human framing: Praxis gives AI agents shared organizational memory across scattered business knowledge, operational data, and historical context.

Changes include:

• Reworked the intro around the problem of disconnected organizational knowledge.
• Added examples across agencies, legal, security, product, healthcare, managed services, and operations.
• Reframed “What Makes Praxis Different” in plain language before technical detail.
• Replaced the broken README image with a Mermaid flowchart plus fallback table.
• Kept current project maturity clear with local-first, experimental, and unsupported status language.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
praxis	Error		Jun 17, 2026 5:51am