Expand description
Cocoon → Mountain progress.update notification.
Cocoon’s Services/Window/Progress.ts:56 emits this on every
Progress.report({ message, increment }) callback during an
extension’s vscode.window.withProgress(...) invocation. Stock
Mountain already handles progress.report with identical payload
semantics; this atom funnels into the same sky:// channel so the
notification-surface name mismatch (update vs report) doesn’t leak
into the renderer contract.