cutplan.py gains deterministic editing helpers: find_placement, placement_fits
(bounds + kerf-aware overlap), snap_x (snap to stock edges / neighbour ±kerf),
relocate (move a placement to a stock piece / position), rotate_placement.
The BOM Cut Layout tab is now editable: it holds a persistent CutPlan; pieces are
draggable (_Piece) — on drop they snap, validate, and either commit or revert with
a status message; you can drag a piece onto another stick/sheet to reassign it,
double-click a panel to rotate it, and right-click to lock (locked pieces can't be
dragged). "Find better layout" / "Try alternative" regenerate the auto plan.
119 tests pass (snap, fits/overlap, relocate-between-sticks, rotate). Window +
drag/rotate handlers verified offscreen; interactive drag/print needs a display.
Known follow-up: lock-aware re-optimization (locked pieces currently protect against
drags but aren't yet preserved across a fresh auto-layout).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
rob
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