Module invocation 

Invocation types for tracking task execution.

Three types form a unified invocation model:

• InvocationHandle — distributed execution handle (status via backends)
• SyncInvocation — sync execution result (status in-memory)
• Invocation — unified enum combining both

Structs

InvocationHandle

Handle to a submitted invocation with typed result access.

SyncInvocation

Synchronous invocation result — created when dev_mode_force_sync = true.

Enums

Invocation

Unified invocation type — same API for sync and distributed execution.