Support remote code-mode hosts in app-server - #35098
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## What changed - Add `--code-mode-host ws://...` and `wss://...` support to `codex app-server`, gated by the `code_mode_host` feature. When omitted, app-server continues to start a local host. - Share one remote WebSocket connection across the process's threads, using the configured HTTP client's proxy and TLS policy and preserving the existing framed host protocol. - Reject invalid host URLs, bound WebSocket frame sizes, close connections cleanly, and return an error when a connection exceeds 1,024 pending delegate calls without disconnecting it. ## Testing - Cover CLI validation, WebSocket protocol execution and shutdown, connection sharing across app-server threads, and delegate-call capacity recovery. GitOrigin-RevId: 715e82d4d9db1e7e2f91b754a777dcab504e2ae4
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Support remote code-mode hosts in app-server
What changed
--code-mode-host ws://...andwss://...support tocodex app-server, gated by thecode_mode_hostfeature. When omitted, app-server continues to start a local host.Testing