- Add `list()` method to generate a full workspace file tree
- Introduce `WorkspaceItem` and `WorkspaceList` structs
- Remove `HeropromptSession` to simplify the public API
- Rename Heroscript action to `heropromptworkspace.configure`
- Enable full heroscript encoding/decoding for workspaces
- Add `select_all` option to recursively add directory contents
- Implement `select_all_files_and_dirs` for file traversal
- Rework prompt building with file tree and content formatters
- Improve `get_file_extension` to handle dotfiles and special files
- Update prompt template to use new structured data model
