Add UI-backed whoami tool to MCP server

[chelojimenez]

Summary

• Add a bundled MCP app UI for whoami and wire it into the tool response
• Gate UI behavior on client app capabilities and route tool registration through a session-aware registrar
• Update the MCP package build so the UI is bundled before dev, deploy, and typecheck flows

Testing

• Not run (not requested)

[chelojimenez]

✅ Snyk checks have passed. No issues have been found so far.

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[github-actions]

MCP worker preview

Preview URL: https://mcpjam-mcp-pr-1894.marcelo-1cb.workers.dev
MCP endpoint: https://mcpjam-mcp-pr-1894.marcelo-1cb.workers.dev/mcp
Built from af33d3f. Each push overwrites the mcpjam-mcp-pr-1894 worker, so the URL is stable for the life of the PR.
The live mcpjam-mcp-staging worker only changes on merge to main. This preview worker is deleted when the PR is closed.

[github-actions]

Internal preview

Preview URL: https://mcp-inspector-pr-1894.up.railway.app
Deployed commit: b08a7c3
PR head commit: af33d3f
Backend target: staging fallback.
Health: ❌ Convex unreachable — see upsert-preview job logs (staging may need convex deploy)
Access is employee-only in non-production environments.