[iamnbutler]

Closes two native2 tool gaps from native2/CUTOVER.md.

Background paste preparation. native2's background Command-V landed only when the target app was already active. #99 passed earlier only because TextEdit happened to be frontmost, and the #114 Finder paste ended unknown with the clipboard replaced. A paste into an inactive app now prepares the exact window the way Peekaboo does:

• a SkyLight SLPSPostEventRecordTo activation record;
• a window-routed click on blank title-bar chrome (Peekaboo's chrome geometry, confirmed with an AX hit test on the window itself);
• then the keys.

A window whose title row has no blank chrome (Finder's toolbar) is refused before any input, with a desktop_focus hint and the clipboard restored. The shipped stack refuses an inactive Finder too. live-check #114 now focuses Finder first, which Node's foreground desktop_open did implicitly.

desktop_dialog_answer path. Ported from Peekaboo's DialogService+FileDialogPath:

• focus the panel;
• expand a collapsed Save panel;
• set its PathTextField, or use Go to Folder (Command-Shift-G, set or type the path, Return);
• set a Save panel's name;
• read the folder and name back.

The panel's focus check accepts a sheet, or Go to Folder's sheet within it, holding focus.

Live (standalone native2 host and MCP, --server):

• live-check --only 70,77,81,82,83,86,89,92,96,99,107,110,111,114 passes all 26 checks twice. feat: paste an image or files into a native text area with desktop_insert, or leave the clipboard replaced on request #99 passes with Finder frontmost, so the paste is a real background paste.
• TextEdit "Export as PDF…" Save sheet: the path went in through Go to Folder and the name read back. The outcome was unknown, because this macOS's Save sheet has no PathTextField to read the folder back from (same logic as shipped). The panel was then cancelled. A standalone Open panel is refused, as on the shipped stack. Both are recorded under "Limits both stacks share" in CUTOVER.md.

Tests: native2 RuntimeTests (+ DialogPathTests) and CoreTests pass.