- WorkspaceFiles: writeFile, deleteFile, moveFile with path safety
- writeFile: text/binary, auto-create dirs, overwrite option
- deleteFile: idempotent, uses lstat (removes symlinks not targets)
- moveFile: unix mv semantics, overwrite defaults to false
- All mutations auto-refreshFiles() in File Explorer
- Symlink escape prevention via realpath(dirname) check
- PluginPromptEditor: insertText, getText, getSelection, onPaste, onKeyDown, focus
- Uses CM6 EditorView.domEventHandlers() via Compartment (not raw DOM)
- Handlers registered before mount are preserved and applied on mount
- First-to-consume-wins ordering for multi-plugin scenarios
- insertText replaces selection (not inserts after)
- PluginAttachments: insertFileReference, getAttachedFiles, removeFileReference
- insertFileReference validates file exists before inserting @path
- Does not auto-focus editor (unlike prompt.insertText)
- @file regex requires file extension to avoid matching emails
- Server endpoints: PUT /file, DELETE /file, POST /file/move
- All work for local and federated machines
- Tests: 31 unit tests, 9 integration tests, 5 client tests
- Docs: 3 new sections in plugins.md
