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## Why `codex-core` was carrying the embedded system-skill sample assets (and a `build.rs` that walks those files to register rerun triggers). Those assets change infrequently, but any change under `codex-core` still ties them to `codex-core`'s build/cache lifecycle. This change moves the embedded system-skills packaging into a dedicated `codex-skills` crate so it can be cached independently. That reduces unnecessary invalidation/rebuild pressure on `codex-core` when the skills bundle is the only thing that changes. ## What Changed - Added a new `codex-rs/skills` crate (`codex-skills`) with: - `Cargo.toml` - `BUILD.bazel` - `build.rs` to track skill asset file changes for Cargo rebuilds - `src/lib.rs` containing the embedded system-skills install/cache logic previously in `codex-core` - Moved the embedded sample skill assets from `codex-rs/core/src/skills/assets/samples` to `codex-rs/skills/src/assets/samples`. - Updated `codex-rs/core/Cargo.toml` to depend on `codex-skills` and removed `codex-core`'s direct `include_dir` dependency. - Removed `codex-core`'s `build.rs`. - Replaced `codex-rs/core/src/skills/system.rs` implementation with a thin re-export wrapper to keep existing `codex-core` call sites unchanged. - Updated workspace manifests/lockfile (`codex-rs/Cargo.toml`, `codex-rs/Cargo.lock`) for the new crate.