layout.py: cutting-stock nesting — 1D lumber (first-fit-decreasing into 8' sticks,
kerf-aware) and 2D plywood (shelf packing onto 4x8 sheets), plus stock_counts
(now drives the accurate buy-counts) and waste_summary. Tested headlessly.
gui/bom_window.py replaces the cut-list QMessageBox popup with a tabbed window:
- Cut List + Shopping List tabs (printable via QPrinter).
- Cut Layout tab: a QGraphicsScene diagram of pieces packed onto each stick/sheet
with waste, a "Try another arrangement" button (cycles ordering heuristics),
and Print. Verified offscreen — the layout renders correctly.
96 tests pass.
Deferred (phase 2): drag-to-rearrange pieces, true-optimal nesting, generated
step-by-step instructions, and jig suggestions.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
