Remove unsupported scalar-by-array overload from cv.divide type definition

[Copilot]

TypeScript types incorrectly advertised a divide(scale, src2, dst, dtype?) overload that doesn't exist in the OpenCV.js WASM binary, causing runtime failures:

// TypeScript accepted this, but failed at runtime with "Cannot pass number as a Mat"
cv.divide(1 / srcStd, sourceNormalized, sourceNormalized);

Changes

• Removed non-existent divide(scale: double, src2: InputArray, dst: OutputArray, dtype?: int) overload from core_array.ts
• Added documentation note explaining C++ OpenCV vs OpenCV.js differences and workaround pattern
• Added test suite validating correct usage and TypeScript type checking

Workaround

// Use Mat.ones with scale parameter for scalar division
const ones = cv.Mat.ones(3, 3, cv.CV_32F);
cv.divide(ones, sourceNormalized, dst, 1 / srcStd);

TypeScript now correctly rejects scalar-first parameter at compile time: Argument of type 'number' is not assignable to parameter of type 'Mat'

Original prompt

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This section details on the original issue you should resolve

<issue_title>cv.divide overloading doesn't work</issue_title>
<issue_description>

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes cv.divide overloading doesn't work #65

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