Enhanced solver parameter control for performance tuning

[wspringer]

Summary

• Enhanced solver parameter control with 40+ new HiGHS options for fine-grained performance tuning
• Added comprehensive support for solver control, tolerances, simplex options, MIP options, logging, and algorithm-specific parameters
• Maintains full backward compatibility - existing code continues to work unchanged

Changes Made

• Schema Enhancement: Extended OptionsSchema in src/schemas.ts with 40+ validated solver parameters
• Documentation: Updated README with comprehensive options documentation and examples
• Test Coverage: Added extensive test suite covering all new options and validation scenarios
• Changeset: Created changeset for minor version bump (backward compatible enhancement)

Key Areas for Review

• Option Validation: All parameters are validated against HiGHS revision fcfb5341462f8a7db5ef5038613413f97d6cac3d capabilities
• Type Safety: Comprehensive Zod schemas with proper type constraints and ranges
• Test Coverage: 44 tests passing, including validation of invalid option values
• Backward Compatibility: Existing API unchanged, all new options are optional

Test Plan

• All existing tests continue to pass
• New comprehensive test suite for enhanced options
• Validation tests for invalid parameter values
• Integration tests with various solver algorithms
• Linting and type checking passes

Fixes #25

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