Module progress 

LSP Work Done Progress protocol support for loading indicators.

Implements the window/workDoneProgress protocol to show registry fetch progress in the editor UI.

Protocol Flow

1. window/workDoneProgress/create - Request token creation
2. $/progress with WorkDoneProgressBegin - Start indicator
3. $/progress with WorkDoneProgressReport - Update progress (optional)
4. $/progress with WorkDoneProgressEnd - Complete indicator

Drop Behavior

If dropped without calling end(), spawns a cleanup task to send the end notification. This is best-effort - the task may not complete if the runtime is shutting down.

Structs

RegistryProgress

Progress tracker for registry data fetching.