Update Xpress solver integration for v9.8 with backward compatibility #893
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Summary
Modernizes the Xpress solver integration to use the current API (v9.8) with enhanced status reporting.
Changes
Testing
✅ All 162 Xpress tests PASSED (XPRESS_PyTest)
✅ Tested with Xpress 9.8 and 9.6
✅ No breaking changes
Compatibility