* Add comprehensive API special relations tests
- Implement tests for all 5 special relations API functions:
* Z3_mk_linear_order - Linear order relation
* Z3_mk_partial_order - Partial order relation
* Z3_mk_piecewise_linear_order - Piecewise linear order relation
* Z3_mk_tree_order - Tree order relation
* Z3_mk_transitive_closure - Transitive closure of a relation
- Test coverage achieved: 100% (5/5 lines) in src/api/api_special_relations.cpp
- Added comprehensive test cases covering:
* Basic functionality with different sorts
* Different index parameters
* Expression creation and integration
* Edge cases and variations
🤖 Generated with Claude Code
* staged files
* remove files
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Co-authored-by: Daily Test Coverage Improver <github-actions[bot]@users.noreply.github.com>
