fix(mcp): name FlatBar in the autonest engine description

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

OpenNest.Mcp/Tools/NestingTools.cs

@@ -30,6 +30,7 @@ namespace OpenNest.Mcp.Tools
             + "Irregular: irregular profiles; no-fit-polygon packing into notches and gaps, best-fit pairs. "
             + "Rectangles: plain and near-rectangular parts; packs each part as its bounding box, fastest. "
             + "Circles: round parts (blanks, washers, flanges); packs each part as its enclosing circle; places nothing when any part is not round. "
+            + "FlatBar: flat bar, parts about as wide as the bar; each stock cut as one row of parts along its length, shaped ends nested together; not run by Default. "
             + "Fill: many copies of few drawings; lattice fill with pairs and rectangle best-fit. "
             + "Strip: Fill variant laying mixed drawings in strips. "
             + "Vertical Remnant, Horizontal Remnant: Fill variants keeping a right-side or top-side drop. "