Reserved metadata fields

id is used to locate the Session file, must match the first 8 characters of the filename, and must be systemwide unique.
module and session are used to create a hierarchy for the Sessions, and to build the menu index:
- module designates the Module to which a Session belongs, and must correspond to a Module key in module_map.yaml.
- session designates the Session number.
title is the name of the Session as shown in the sidebar menu
related_assets (kv-pairs) make it possible to reference the assets by their keys instead of their full file paths.
related_references (kv-pairs) make it possible to reference additional content.
related_form identifies a format file that is used for getting user input.
related_automation identifies an automation that can be initiated from the Session.
automation_depends_on (kv-pairs) identifies Tasks required to have the 'Done' status before the automation can be initiated.
depends_on legacy, no longer in use.