Media, interaction, and product tools

These systems turn engine state into human-visible or editable output. Native capabilities own devices and low-level resources; aether-kit actors compose them into reusable camera and mesh behavior.

Keep frame ownership explicit. Product actors may emit render and audio mail, but native callbacks and presentation remain chassis responsibilities. For visual changes, pair structural/SubstrateHarness checks with captured evidence; for realtime audio, keep allocation and blocking work off the callback.