ATTR.3 Report binder: choose the section for each document

Owner 2026-11-03. Each document in the binder dialog has a section picker (Calculations or Documents), kept in the project. Until someone picks, the guess uses who made it (Engineer), the name (calc, calculation, data sheet, analysis, sizing) and the text (an engineer-of-record line). Only those two document sections exist; no sections of your own. Tests: bin/test-super-binder.mjs, tools/super-test/binder.mjs. In /lab, not released.