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]>
Adds API 1.3 `events.subscribe-paths(kind, globs)` for `file-opened` and `file-saved`: project-relative globs checked before an event is queued or wakes an idle plugin, and again before a queued event is delivered. A new filter replaces the old one atomically; `subscribe` restores unfiltered delivery; filters survive idle reclamation. Also `workspace.project-of(path)`, the most specific open project containing a document (reading it still needs `project.read`). Closes#1958.
Co-authored-by: arnaud-ritti <[email protected]>