NOTES.1 Pasteboard, show/hide notes and private notes

From a Discord member on Discord (keeps scratch notes and snapshots beside the sheet so they never reach the client). Built in /lab 2026-11-03, not released. Pasteboard: the area around each sheet holds notes and picture snapshots at paper size; nothing on it prints. Notes: any markup can be a note, shown or hidden with Shift+H or the bar switch, kept out of print, flattened copies, exports and other PDF readers. Private notes: encrypted with the writer's own passphrase (no recovery), not sent to Live, assistants or the clipboard; colleagues' saves carry them untouched and nothing tells them one exists. Save a clean copy removes all of it. **SuperCad Studio:** private notes are encrypted files in the project's Documentation/Private notes, never in the PDF, not even sealed, and are left out of the report binder, document exports, Finalize and export and Email this. **Untested:** a real large vector set, a desktop build, a real two-person Live session. Tests: 70, 38 and 27 passed. Log docs/0.9-sessions/notes-pasteboard-09.md.