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Daily Test Coverage Improver: Add comprehensive boolean and MNIST operation tests (#64)

* Daily Test Coverage Improver: Add comprehensive boolean and MNIST operation tests

## Summary

Added extensive test suites for boolean tensor operations and MNIST data loading functionality, targeting areas with low or zero coverage to improve test infrastructure and exercise critical code paths.

## Problems Found

1. **Limited boolean tensor operation testing**: RawTensorBool had 57.1% coverage with many logical and comparison operations undertested
2. **Zero MNIST module coverage**: MNIST data loading functionality had 0.0% coverage despite being critical for ML workflows
3. **Missing edge case coverage**: Boolean operations, data loading error handling, and type-specific operations lacked comprehensive testing

## Actions Taken

### Added TestBooleanOperations.fs with 13 comprehensive test methods:

**Boolean Logic Operations:**
- TestBooleanTensorLogicalOperations - AND/OR operations using AddTT/MulTT
- TestBooleanTensorWithScalars - Scalar boolean operations with true/false values
- TestBooleanTensorAlphaOperations - Alpha parameter handling in boolean arithmetic

**Comparison Operations:**
- TestBooleanTensorComparisons - All comparison operators (lt, gt, le, ge, eq, ne)
- TestBooleanTensorEqualsAndAllClose - Tensor equality and tolerance-based comparisons

**Reduction and Aggregation:**
- TestBooleanTensorReductionOperations - Sum operations with dimension reduction
- TestBooleanTensorMinMaxReduction - Min/max operations across tensor dimensions

**Edge Cases and Validation:**
- TestBooleanTensorBasicProperties - Shape, dtype, and element count validation
- TestBooleanTensorSliceOperations - Row and column slicing operations
- TestBooleanTensorCastingOperations - Type conversion to/from Int64
- TestBooleanTensorSignOperation - SignT operation (returns self for boolean)
- TestBooleanTensorUnsupportedOperations - Exception handling for unsupported ops
- Te... (continued)

3213 of 6842 branches covered (46.96%)

Branch coverage included in aggregate %.

2 of 2 new or added lines in 1 file covered. (100.0%)

2013 of 2497 relevant lines covered (80.62%)

1009370.79 hits per line