This package owns the SDK/package-author matrix binary. It does not depend on provider overlay packages, managed host packages, platform system actors, device-link implementations, or broker-authority/signing packages.

Initial command surface:

matrix init [dir]
matrix add actor <name>
matrix actor <name>
matrix configure --key <key> --cloud <url> --space <space>
matrix run <entry> --mount <mount>
matrix invoke <mount> <op> [json]

matrix run starts a standalone actor runner in the current folder. matrix invoke sends a Matrix request envelope to that runner through its local control port. Managed host promotion belongs to provider overlays that consume the SDK; it is not an SDK-layer requirement.