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## Why The package builder should be easy to run during local iteration. Requiring callers to provide both a target triple and an output directory every time makes the common host-package case more awkward than necessary. This PR keeps explicit overrides available, but makes the default invocation useful: build for the current host platform and place the package in a fresh temporary directory. Because a temp output path is otherwise easy to lose, the builder continues to print the final package directory path when it completes. ## What changed - Makes `--target` optional and maps the host OS/architecture to supported Codex package target triples. - Uses GNU Linux target triples for Linux host defaults, while keeping the musl targets available for release jobs that pass `--target` explicitly. - Makes `--package-dir` optional and creates a new `codex-package-*` temp directory when omitted. - Documents the new defaults in `scripts/codex_package/README.md`. ## Verification - Compiled `scripts/build_codex_package.py` and `scripts/codex_package/*.py` with `PYTHONDONTWRITEBYTECODE=1`. - Ran `scripts/build_codex_package.py --help` from outside the repo. - Verified Linux host detection maps `x86_64` and `aarch64` to GNU target triples. - Ran a fake-Cargo package build while omitting both `--target` and `--package-dir`; verified the generated metadata target, expected package files, and printed temp package path. - Ran a fake-Cargo package build for `x86_64-unknown-linux-gnu` and verified `codex`, `bwrap`, and `rg` are assembled into the package.