- Group A: Add : () => AnyObjectSchema type annotations to MCP notification
schema constants (useIdeSelection, useIdeLogging, usePrompts, channelNotification)
- Group B: Add isStructuredOutputAttachmentMessage type guard for structured
output attachment payloads (execAgentHook)
- Group C: Add isMessageDeltaStreamEvent type guard for message_delta
stream event usage extraction (forkedAgent)
These as any casts also exist in the upstream CCB source — this fix provides
real type safety without changing any runtime behavior.