feat: G2/G3 Arc Support + Bambu Studio Wipe Fix

Arc support:
- Proper bounding box calculation for G2/G3 arcs via cardinal angle crossing
- Arc-aware wipe path distance and endpoint interpolation
- Absolute extrusion E reset fix (issue #17)

Bambu Studio wipe fix:
- Don't store travel line reference during wipe blocks
- Prevents Travel Fix Up injection inside WIPE_START/WIPE_END
- Fixes missing chunks in Bambu Studio preview and print quality

Tests:
- 10 geometric correctness tests for arc bounding box
- Visual bbox comparison script

Author: adele-with-a-b

bricklayers.py

@@ -2183,7 +2183,7 @@ def process_gcode(self, gcode_stream):
                     buffer_lines.append(myline)
 
                 self.last_noninternalperimeter_state = current_state
-                if simulator.moved_in_xy:
+                if simulator.moved_in_xy and not feature.wiping:
                     myline.current = current_state
                     self.last_noninternalperimeter_xy_line = myline