Remove the active TreeShellIframeHost path and legacy env flag so rust_family only mounts the Rust/WASM DOM shell host.
Move legacy iframe host files to ignored recycle storage, clear tracked recycle cache entries, and update tree-domain design wording to the current no-iframe position.
Align filetree default active rows with doc:<documentId> and update the renderer artifact bridge contract to dom_wasm.
lix-2026