Serve live UI during dev CLI sessions

[RhysSullivan]

Summary

• start a Vite child server when the local daemon runs with EXECUTOR_DEV=1
• proxy SPA and asset requests to Vite while keeping API and MCP routes on the daemon
• configure Vite HMR to connect directly to the child server port

Verification

• bunx oxfmt --check apps/local/src/serve.ts apps/local/vite.config.ts

Stack

• This is PR 1 of 3.

Stack

1. Serve live UI during dev CLI sessions #839 👈 current
2. Match daemon scope before reuse #840
3. Expand agent-facing Executor configuration tools #841

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commit: 59ed913