Robot help: readable parameter types and published Robot names #641

Why

getRobotHelp() backs the MCP tool transloadit_get_robot_help, and since transloadit/content#7165 it also backs the WebMCP get_robot_docs tool on the docs pages. Agents read each parameter's type to work out what to send, and some types don't say:

• In @transloadit/node 6.6.0, /image/resize returns use with type union<union<string | [object Object] | [object Object]> | object>.
• In 4.14.0, /image/resize width is union<ZodEffects | ZodEffects>.

listRobots() also derives names from schema keys, so the catalog lists /digital/ocean/import and /digital/ocean/store. The published names are /digitalocean/*. isKnownRobot() accepts both spellings, but getRobotHelp() looks up metadata under /digital/ocean/*, so /digitalocean/import and /digitalocean/store come back with the placeholder summary (Robot /digitalocean/store) and no examples.

What

• Render nested object and effect types readably, for example number | string (expression), instead of [object Object] or ZodEffects.
• Make listRobots() return the published Robot names, and resolve metadata for them in getRobotHelp().

Found during council review of transloadit/content#7165.