Add test coverage for VectorSimilarityUtils functions

[Copilot]

The VectorSimilarityUtils module (cosineSimilarity, jaccardSimilarity, hammingDistance, hammingSimilarity) was extracted from VectorSimilarityTask but lacked dedicated tests.

Changes

• Added VectorSimilarityUtils.test.ts with 63 test cases covering:
  • All four similarity/distance functions
  • All typed array types (Int8Array, Uint8Array, Int16Array, Uint16Array, Float32Array, Float64Array)
  • Edge cases: zero vectors, orthogonal vectors, opposite vectors, single element vectors
  • Error handling for mismatched vector lengths
  • Cross-function consistency (e.g., hammingSimilarity = 1 - hammingDistance)

Example Test Coverage

test("should calculate cosine similarity for orthogonal vectors", () => {
  const a = new Float32Array([1, 0, 0]);
  const b = new Float32Array([0, 1, 0]);
  expect(cosineSimilarity(a, b)).toBeCloseTo(0.0, 5);
});

test("should work with Int8Array", () => {
  const a = new Int8Array([10, 20, 30]);
  const b = new Int8Array([10, 20, 30]);
  expect(cosineSimilarity(a, b)).toBeCloseTo(1.0, 5);
});

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