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A codex_local agent configured with a manual model id (e.g. gpt-5.5-pro) failed every ACP-lane run with acpx_session_config_failed: codex-acp validates session/set_config_option values against its internal model list and rejects ids it does not advertise (ACP -32602), even though the Codex CLI lane accepts manual model ids via --model. The existing ACP->CLI fallback only covered thrown startup errors, not structured failed results from the configure_session phase. Auto-selected ACP now falls back to the CLI lane when the ACP server rejects session configuration, preserving the configured model/effort/fast-mode via startup args. Explicit engine=acp remains strict and fails loudly. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>