docs(demo): surface current IVR route-matrix proof

[CapuchaRojo]

🚀 VetCan Pull Request

Summary

Updates the Studio/demo documentation to surface the current IVR route-matrix proof after the latest merged voice-routing work.

This PR highlights:

• Press 1 renewal/new-patient/veteran conversion flow
• Press 2 annual Florida/MMU state-card separation
• Press 3 deterministic after-hours classifier
• Press 4 hidden staff-controlled reschedule posture
• Separate staff-confirmed cancellation lane
• Payment-safe boundaries
• Route-boundary regression evidence

Guardrails

• Docs-only change.
• No runtime behavior changed.
• No payment behavior changed.
• No Acuity mutation behavior changed.
• No Studio UI or deck binary changed.
• Does not claim live GPT/RAG.
• Does not claim public self-service reschedule.
• Does not claim HIPAA readiness or guaranteed veteran eligibility.

Validation

• git diff --check
• reviewed against ivr routing system.txt route matrix and A17/A22 demo docs