## What changed
- Add the `environmentConfig/read` RPC for selecting literal TOML paths from executor-local config and requirements layers.
- Return layer precedence, cloud insertion points, source and base-directory metadata, and executor home and hostname context without normalizing path-bearing values.
- Expose the operation through both remote clients and local `Environment` instances, with invalid selectors reported as invalid parameters.
## Testing
- Cover projected remote config reads and rejection of empty selectors.
GitOrigin-RevId: fee15bf833de6bcb2058d405ed5b1d5d928d7218