feat: non-parametric frquency domain identification algorithm#2

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jamestjsp wants to merge 2 commits intofeat/sippy-factory-patternfrom

feat/frequency-domain-impl

Commits on Oct 20, 2025

feat: non-parametric frquency domain identification algorithm
jamestjsp
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refactor: reorganize imports and enhance validation warnings in spectral utilities
jamestjsp
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