DoughCalc build session - v6 through v18 deployed live, each backed up. Separated Bread/Pizza pan selectors, added Standard recipes, scaling bake-time/temp with altitude note, live common-measurement conversions, Bake Notes save-to-DB, and localStorage groundwork for a future standalone app. Logged item #24 (future roadmap, deferred). Fixed ARTIFACTS-80.md gap (DoughCalc was missing).

13 DoughCalc versions (v6-v18) deployed and verified byte-for-byte; standalone error-checker script built and run before every deploy from v15; build diary (item #23) kept current; roadmap item #24 logged; ARTIFACTS-80.md and handoff-08.md updated at close; LEGACY-80.md session entry appended; full-platform snapshot taken mid-session at USR369 request.