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## Why App-server config writes were leaving existing threads partially stale. After a config mutation, the app-server told each live thread to run `Op::ReloadUserConfig`, but that path only re-read the user `config.toml` layer. Settings that came from the app-server's materialized config snapshot did not propagate to existing threads until restart. This change prevent a FS access from `core` for CCA. ## What changed - add `CodexThread::refresh_runtime_config()` and `Session::refresh_runtime_config()` so the app-server can push a freshly rebuilt config snapshot into a live thread - rebuild the latest config with each thread's `cwd` after config mutations, then refresh the thread from that snapshot instead of asking it to reload only `config.toml` - keep session-static settings unchanged during refresh, while updating runtime-refreshable state such as the config layer stack, `tool_suggest`, and derived hook/plugin/skill state - keep `reload_user_config_layer()` as the file-backed fallback for legacy local reload flows, but route the shared refresh logic through the new runtime refresh path ## Testing - add a session test that verifies `refresh_runtime_config()` rebuilds hooks from refreshed config - add a session test that verifies runtime-refreshable fields update while session-static settings like `model` and `notify` stay unchanged --------- Co-authored-by: Codex <noreply@openai.com>