Merge commit 'd803bfe2b1fe7f5e219e50ac20d6801a0a58ac75' as 'vendor/ruvector'

vendor/ruvector/examples/scipix/tests/fixtures/README.md

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+# Test Fixtures for ruvector-scipix
+
+This directory contains test fixtures including sample images, expected outputs, and configuration files for unit and integration tests.
+
+## Directory Structure
+
+```
+fixtures/
+├── images/           # Test images
+│   ├── simple/      # Simple equations
+│   ├── complex/     # Complex expressions
+│   ├── matrices/    # Matrix expressions
+│   └── symbols/     # Special mathematical symbols
+├── expected/        # Expected LaTeX outputs
+├── configs/         # Test configuration files
+└── README.md        # This file
+```
+
+## Test Images
+
+### Simple Equations
+- `simple_addition.png` - Basic x + y
+- `simple_fraction.png` - Simple fraction 1/2
+- `quadratic.png` - Quadratic formula
+
+### Complex Expressions
+- `nested_fraction.png` - Nested fractions
+- `integral.png` - Integral with limits
+- `summation.png` - Summation notation
+
+### Matrices
+- `matrix_2x2.png` - 2x2 matrix
+- `matrix_3x3.png` - 3x3 matrix
+
+### Special Symbols
+- `greek_letters.png` - Greek letters
+- `operators.png` - Mathematical operators
+
+## Expected Outputs
+
+Each test image has a corresponding `.txt` file in the `expected/` directory containing the expected LaTeX output.
+
+## Adding New Fixtures
+
+1. Add the test image to the appropriate subdirectory
+2. Create a corresponding expected output file
+3. Update test cases in the unit tests to reference the new fixture
+
+## Generating Test Images
+
+You can use the synthetic data generator in `tests/testdata/synthetic_generator.rs` to create test images programmatically.
+
+## Notes
+
+- All test images should be in PNG format
+- Expected outputs should use standard LaTeX notation
+- Keep image sizes reasonable (< 1MB) for fast test execution