fix: update EtchBendLines submodule to ACadSharp version
Advances submodule from netDxf (89d987f) to ACadSharp (da4d322), picking up all fixes from the fabworks-api branch: - Switch from netDxf to ACadSharp for DXF operations - Fix ACAD_GROUP dictionary, upgrade ACadSharp to 3.4.9 - Fix bend line detection and ByLayer color - Fix degree symbol encoding (reverted in submodule, handled by caller) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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