Closes#1948
Plugins receive debounced batches of files created, changed and removed outside the editor in open projects, as SDK `Event::FilesChanged` (delivered through `other("files-changed", …)`, so released WIT is unchanged), under the `events` capability and the plugin's path filters. Activation on these events requires API 1.3. Batches are coalesced per plugin through its actor, survive cancellation without losing deltas, and are dropped when the project or host shuts down.
Co-authored-by: arnaud-ritti <[email protected]>
Closes#1952
API 1.3 adds a diagnostics provider for unsaved documents: the host sends versioned text for the declared languages after a 300 ms debounce, cancels superseded calls, drops late or stale answers under the editor-provider budget, and clears results with the document, project or plugin. Ranges are UTF-16. Actor panics are contained, queued work is rejected after a host panic, and diagnostics arriving after plugin cleanup are discarded. Verified on macOS with the diagnostics fixture.
Co-authored-by: arnaud-ritti <[email protected]>