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## What changed - Allow `features.code_mode_host` to use a configuration table with `disable_in_process_fallback`. When enabled, failure to start the standalone host is returned as tool output instead of falling back to embedded V8. - Preserve the existing fallback behavior by default and continue accepting the boolean feature toggle. - Limit displayed host paths in spawn errors to 512 bytes while retaining the executable-bearing suffix and valid UTF-8 boundaries. ## Testing - Cover boolean and table-based feature configuration, fallback-disabled host failures, and bounded ASCII and UTF-8 error paths. GitOrigin-RevId: ab3d014e79054c2f8beef9a658915f01cca197b2