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* DXF/DWG: keep hatch gradients through save and reopen (fixes #80) The HATCH writer never emitted a gradient and the reader always set `gradient: None`, so a GRADIENT fill reopened as a plain SOLID hatch after any DXF or DWG save. - Writer: native HATCH groups per the DXF Reference (450 gradient flag, 451, 452 two-colour, 453 colour count, 460 angle in radians, 461 shift (0 = centered), 462 tint, 463 per-colour records with 63 ACI and 421 true colour, 470 name), plus a `CADCRAFT` `GRADIENT` xdata copy (name cut to 255 bytes, angle, centered, colour names). - Reader: native groups win when present (another program may have edited them); otherwise the xdata copy is used. The xdata is what survives DWG saves: the file is R2000 (AC1015), whose DWG HATCH has no gradient fields, so the DWG bridge drops the native groups. - Hostile values (NaN angles, out-of-range colours, extra colour records, missing groups) fall back to the GRADIENT command's defaults. Tests: gradient_hatch_roundtrips_through_dxf, gradient_hatch_roundtrips_through_dwg, gradient_falls_back_to_xdata_and_native_groups_win, long_gradient_name_is_cut_only_in_xdata, hostile_gradient_groups_never_panic. Co-Authored-By: Claude Opus 5.5 <[email protected]> * contributors: add vangel76 Co-Authored-By: Claude Opus 5.5 <[email protected]> * Gradient test: expect \U+ escapes now that non-ASCII text is escaped (#169) Co-Authored-By: Claude Opus 5.5 <[email protected]> --------- Co-authored-by: Claude Opus 5.5 <[email protected]> Co-authored-by: Brandon Thomas <[email protected]>