SKILL.md namespace
Scenery skills use the standard SKILL.md format, so they stay portable. The top level of the frontmatter holds only the standard keys: name, description, license and metadata.
Everything specific to Scenery sits under metadata.scenery: version, publisher, declared permissions, declared execution settings, model preferences, schemas, triggers, workflow and declared tools. A skill that uses none of them is still a valid standard skill.
Putting extensions in one namespace means other tools can ignore what they do not understand, and Scenery never claims top-level keys the standard may use later. Top-level keys that start with vh_ are rejected.
For every key, see the SKILL.md.