[gopher194]

Summary

• Expand the API Center demo with a presenter-ready walkthrough, live environment links, persona-based scenes, and explicit fallback paths.
• Repair Grid Telemetry and MCP registration: detect placeholder images, retry transient OpenAPI failures, preserve the document version, use schema-compatible metadata, and register MCP assets through ARM with readback verification.
• Correct the Grid MCP endpoint to /mcp and add registration regression checks and MCP endpoint integration coverage.
• Include the branch's existing environment setup, APIM link verification, regional deployment guidance, presentation update, and Squad tooling upgrade.

Validation performed during development

• Grid registration and shared catalog helper regression checks passed.
• REST/MCP integration tests passed (4 tests).
• Both application services deployed successfully to the existing demo environment.
• Both registration scripts completed successfully against Azure; persisted OpenAPI metadata reports version 3.1.1.
• Live MCP initialization, tool discovery, and the A12 backend health call succeeded.
• Updated walkthrough local links and whitespace checks passed.

Scope

This PR contains the four existing commits on expanded-demo. The latest commit is 269697a; the working tree was clean when opening the PR. No infrastructure deployment or new agent creation is performed by opening this PR. The full repository suite was not rerun for PR creation.