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## Why Test callers need one composable way to create app-server fixtures instead of a growing family of overlapping constructor implementations. ## What - add a feature-complete TestAppServer::builder() - make the default builder own a temporary CODEX_HOME and select the automatic test environment - expose builder knobs for no automatic environment, explicit CODEX_HOME, program, arguments, plugin startup tasks, environment overrides, managed config, and JSON logging - keep the existing public constructor surface, but route every constructor through the builder so the new path is exercised immediately - remove the redundant private constructor ladders; caller migration and public constructor removal live in the optional cleanup stack ## Validation - just test -p codex-app-server (940/941 before updating the expected builder error wording) - just test -p codex-app-server auto_env_rejects_explicit_environment_config - just fix -p codex-app-server - just fmt ## Follow-up stacks Cleanup, optional for the benchmark work: 1. [#31451 test: migrate TestAppServer callers to builder](https://github.com/openai/codex/pull/31451) 2. [#31452 test: remove TestAppServer constructors](https://github.com/openai/codex/pull/31452) Benchmark infrastructure: 1. [#31427 test: add delayed exec-server transport](https://github.com/openai/codex/pull/31427) 2. [#31295 bench: add cold skill load macrobenchmark](https://github.com/openai/codex/pull/31295) 3. [#31428 bench: add e2e benchmark entrypoints](https://github.com/openai/codex/pull/31428) 4. [#31429 ci: smoke Bazel e2e benchmarks](https://github.com/openai/codex/pull/31429)