Add first-party render-ui MCP tools and the MCP-Apps shell

[RhysSullivan]

Revives the generative-UI shell from #263 as a first-party capability (no plugin seam) with persistence.

• New @executor-js/mcp-apps-shell package: the sandboxed double-iframe shell (Sucrase JSX compile, shadcn/Recharts/Lucide scope, runtime Tailwind, TanStack-native tools proxy, trusted elicitation modal)
• render-ui / list-artifacts / show-artifact tools registered directly in the MCP host; execute-action(+-resume) gated on the client's MCP Apps capability via oninitialized re-sync
• render-ui is always advertised: MCP-Apps clients get the embedded app; other clients get a deep link to /artifacts/:id. Every successful render persists the artifact
• execute-action re-cloned from today's executeCode so it carries the Make paused-execution resume survive MCP session changes #1300 resume-fallback path
• Provided-globals validation is generated from the shell's real eval scope with a drift-pin test
• Shell browser suite, tool-server tests, and the sunpeak MCP-Apps e2e harness (capability patch no longer needed upstream; check script fails loud if it regresses)

Stack

1. Add artifact table and core artifacts API #1470
2. Add first-party render-ui MCP tools and the MCP-Apps shell #1471 👈 current
3. Add the Artifacts console pages #1472

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