[codex] Move release platform rules into bazel package

[anp-oai]

Intent

Keep release-specific Bazel helpers out of the shared Rust crate definitions and colocate them with Bazel platform configuration.

Implementation

Moves multiplatform_binaries and its platform list from defs.bzl into bazel/platforms/release_binaries.bzl and updates the CLI load site. Behavior is unchanged.

Validation

• bazel query //codex-rs/cli:release_binaries

Stack: 1 of 6.

[chatgpt-codex-connector]

💡 Codex Review

codex/build/platforms/BUILD.bazel

Line 1 in 730289b

# Release platform rules live in this package.

Keep generated build outputs ignored

Adding this tracked package under build/ by removing the broad ignore makes every other generated tree under /build visible to Git. In workflows that materialize paths the repo already references, such as build/linux/debian_bullseye_amd64-sysroot, git status will be flooded and those generated artifacts can be committed accidentally; keep /build/* ignored and add a narrow exception for /build/platforms/ instead.

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