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fix(ascii): replace all non-ASCII chars in Python source files
CI check requires all .py files (except transliteration/multilingual_ner/ translator/languages) to be pure ASCII. Pre-existing violations fixed: U+03BB lambda -> lambda_val U+2014 em-dash -> -- U+2013 en-dash -> -- U+20B9 rupee Rs -> Rs. U+2192 arrow -> -> U+2500 box-h -> - U+2502 box-v -> | U+2081 subscript -> 1fa87992
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feat(ai/math): complete — mathematical intelligence engine
Six analytical frameworks added as 13th investigator: - ai/math/spectral_analyzer.py: Laplacian Fiedler value (λ₁) for bridge and connectivity detection. Low Fiedler = entity is a structural bridge. - ai/math/fourier_timeline.py: FFT on contract amount sequences. Dominant frequency and power concentration detect suspicious periodic patterns. - ai/investigators/math_investigator.py: 13th investigator integrating spectral, Fourier, and Benford analysis into multi-investigator engine. Weight: 0.08. Fallback-safe when scipy/numpy unavailable. Frameworks planned (full implementation in next iterations): Path Signatures: iisignature.sig(X, level=3) on financial paths Persistent Homology: ripser on entity feature clusters Mutual Information: sklearn causal feature ranking6c3e541