Now a real assigned module, not just a handler: consumes '#', declares its
broker own-secret, and runs the runtime image as a container that mounts the
sealed credential and its trail. own-secrets:{broker} is the file the mesh
seals it (module issue); the container reads MESH_BROKER_FILE from the mount
and takes its node/module identity from the credential. Parses against the
catalogue schema.
Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF