- Explorer tree with inline expand/collapse and keyboard navigation, git colours, change dots, dimmed gitignored entries (fs-list now flags them), file-type badges, resizable explorer. - Editor tabs: preview tab semantics, instant switching with scroll kept, in-place reload when Claude changes an open file. - Go to file: devdesk attach --fs-find (git ls-files or capped find) and a fuzzy-ranked palette (CommandPalette gained custom search/async lists). - Per-session memory of folders and tabs; empty state with recents. Closes #37 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>