Add a micrograd on PowerShell sample#54
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Restructure the micrograd notebook into a readable walkthrough with markdown sections for module setup, helper scripts, scalar computation graphs, backpropagation order, neuron and MLP construction, loss calculation, one training step, the training loop, and final graph rendering. Keep both supported module-loading flows in the notebook: local manifests from the repository artifacts for development testing, and normal installed modules for a fresh kernel. The setup cells guard against switching PSGraph.dll sources after the assembly has already loaded into the PowerShell runspace. Move the reusable micrograd pieces into helper scripts: Value operator behavior, expression/backpropagation graph construction, Neuron/Layer/MLP definitions, Zip, and Sum-Value. Clear saved notebook outputs so the example stays lightweight and rerenders from current code.
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Summary
PSQuickGraphandPSGraphViewmodules.graphHelper.ps1so the sample fails early on unsupported module versions.Dependency
Depends on #53.
Validation
jq empty samples/Notebooks/powershell/micrograd/micrograd-ps.versoPSParserparse check forsamples/Notebooks/powershell/micrograd/graphHelper.ps1Notebook was also smoke-checked locally by the author before this PR.