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## Why The package builder should describe the binaries it is actually packaging, not require callers to restate release metadata out of band. A caller-provided `--version` flag can drift from the workspace version, but running the target entrypoint to discover its version breaks cross-target packages when the produced binary cannot execute on the build host. This PR keeps package metadata tied to the repository source of truth by reading `[workspace.package].version` from `codex-rs/Cargo.toml`. It also prepares the package layout for `codex-app-server` packages: the same package structure can now represent either the CLI entrypoint or the app-server entrypoint while keeping shared sidecars such as `rg`, `bwrap`, and Windows sandbox helpers in the existing package directories. ## What changed - Removes the `--version` CLI flag from `scripts/build_codex_package.py`. - Adds Cargo.toml version discovery for `codex-package.json.version` via `codex-rs/Cargo.toml`. - Adds `--entrypoint-bin` so callers can package a prebuilt entrypoint instead of rebuilding it with Cargo. - Makes `--variant` an explicit choice between `codex` and `codex-app-server`, and uses it to select the cargo binary and packaged `bin/` entrypoint name. - Updates `scripts/codex_package/README.md` to document variants, prebuilt entrypoints, and Cargo.toml version detection. ## Verification - Compiled `scripts/build_codex_package.py` and `scripts/codex_package/*.py` with `PYTHONDONTWRITEBYTECODE=1`. - Ran `scripts/build_codex_package.py --help` and verified `--version` is gone while `--variant` and `--entrypoint-bin` are present. - Verified the package builder reads version `0.0.0` from `codex-rs/Cargo.toml`. - Built a fake cross-target `codex-app-server` package using a non-executable `--entrypoint-bin`; verified metadata records version `0.0.0`, variant `codex-app-server`, and `bin/codex-app-server` as the entrypoint.