Keep external-container visibility tied to the signed surface gap between the player and container physics cylinders, matching gmExternalContainerUI's authored UseRadius range watcher. This prevents a valid ViewContents response from being closed at ACE's natural approach endpoint.
Port Position::cylinder_distance and ACCWeenieObject::ObjectsInRange into Core with conformance coverage for 3-D separation, overlap, mode precedence, and inclusive boundaries.
Release build succeeds and all 5,895 tests pass with five intentional skips.
Co-authored-by: OpenAI Codex <codex@openai.com>
