What changed

• Adds Gutenberg Guidelines-backed sticky notes to Desktop Mode, loading wp_guideline posts tagged with sticky artifact terms into a draggable/resizable desktop note layer.
• Adds a wallpaper context-menu action for creating a new sticky note in desktop mode, with autosave through trackedFetch.
• Hooks sticky notes into the shared WordPress Heartbeat bus so other-tab/editor changes arrive as deltas and deleted/retagged notes disappear without a refresh.
• Scopes sticky placement to virtual desktops: new notes land on the active desktop, switch with Spaces, migrate when a desktop is closed, and survive refresh even when no windows are open.
• Keeps sticky-note editor keystrokes inside the editor so shell/admin global shortcuts do not fire while typing note text.
• Adds REST root config, sticky term resolution/creation, sticky note text parsing, local geometry persistence, and focused tests.
• Updates wp-env so Gutenberg is installed and the Guidelines experiment is enabled automatically for local dev/test containers.
• Documents the new shell config and session-persistence behavior.

Why

Desktop Mode needs to surface Gutenberg Guidelines sticky artifacts directly on the desktop when they are present, keep them fresh across open tabs, and make fresh local environments testable without manual Gutenberg setup.

Validation

• npm run typecheck
• npm run lint
• npm run test:js -- sticky-notes boot-session
• npm run test:js
• npm run build
• npm run package
• unzip -t desktop-mode.zip
• npm run test:php -- --filter='Tests_DesktopMode_StickyNotesHeartbeat'
• Browser smoke in local wp-env: confirmed New sticky note appears in the wallpaper menu and creates a sticky note.