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## Why The package layout gives Codex a stable place for runtime helpers that should travel with the entrypoint. `shell_zsh_fork` still required users to configure `zsh_path` manually, even though we already publish prebuilt zsh fork artifacts. This PR builds on #24129 and uses the shared DotSlash artifact fetcher to include the zsh fork in Codex packages when a matching target artifact exists. Packaged Codex builds can then discover the bundled fork automatically; the user/profile `zsh_path` override is removed so the feature uses the package-managed artifact instead of a legacy path knob. ## What Changed - Added `scripts/codex_package/codex-zsh`, a checked-in DotSlash manifest for the current macOS arm64 and Linux zsh fork artifacts. - Taught `scripts/build_codex_package.py` to fetch the matching zsh fork artifact and install it at `codex-resources/zsh/bin/zsh` when available for the selected target. - Added package layout validation for the optional bundled zsh resource. - Added `InstallContext::bundled_zsh_path()` and `InstallContext::bundled_zsh_bin_dir()` for package-layout resource discovery. - Threaded the packaged zsh path through config loading as the runtime `zsh_path` for packaged installs, and removed the config/profile/CLI override path. - Kept the packaged default zsh override typed as `AbsolutePathBuf` until the existing runtime `Config::zsh_path` boundary. - Updated app-server zsh-fork integration tests to spawn `codex-app-server` from a temporary package layout with `codex-resources/zsh/bin/zsh`, matching the new packaged discovery path instead of setting `zsh_path` in config. - Switched package executable copying from metadata-preserving `copy2()` to `copyfile()` plus explicit executable bits, which avoids macOS file-flag failures when local smoke tests use system binaries as inputs. ## Testing To verify that the `zsh` executable from the Codex package is picked up correctly, first I ran: ```shell ./scripts/build_codex_package.py ``` which created: ``` /private/var/folders/vw/x2knqmks50sfhfpy27nftl900000gp/T/codex-package-pms94kdp/ ``` so then I ran: ``` /private/var/folders/vw/x2knqmks50sfhfpy27nftl900000gp/T/codex-package-pms94kdp/bin/codex exec --enable shell_zsh_fork 'run `echo $0`' ``` which reported the following, as expected: ``` /private/var/folders/vw/x2knqmks50sfhfpy27nftl900000gp/T/codex-package-pms94kdp/codex-resources/zsh/bin/zsh ``` --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/23756). * #23768 * __->__ #23756