Address PR review feedback on get_contrastive_explanation implementation

[Copilot]

All review comments on the get_contrastive_explanation() implementation have been addressed in commit 36284c3.

Changes Made:

• Removed unnecessary local variables - Code now uses self.ontology.mapper and self.ontology.owlapi_manager directly instead of caching them in local variables
• Removed incorrect owlapi_reasoner access - Eliminated getattr(self, "owlapi_reasoner", None) usage as _owlapi_reasoner is the correct attribute and is never None
• Fixed reasoner selection - Now uses self.reasoner_name directly and maps it to the Java ReasonerChoice enum via getattr(RC, self.reasoner_name), respecting the user's configured reasoner instead of defaulting to ELK

The implementation is now cleaner and correctly honors the user's reasoner configuration (HermiT, Pellet, ELK, etc.) when generating contrastive explanations.

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[Copilot]

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