feat: funciones Python para core, cybersecurity, datascience y finance

Agrega funciones Python reutilizables organizadas por dominio:
- core: composicion funcional (pipe, compose, map, filter, reduce, etc.)
- cybersecurity: analisis de amenazas y puertos
- datascience: estadisticas y deteccion de outliers
- finance: indicadores tecnicos y analisis financiero

python/functions/datascience/impute.md

@@ -0,0 +1,32 @@
+---
+name: impute
+kind: function
+lang: py
+domain: datascience
+version: "1.0.0"
+purity: pure
+signature: "def impute(data: list) -> list"
+description: "Reemplaza None y NaN con la media de los valores validos."
+tags: [imputation, missing, python]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: ""
+imports: [math]
+tested: false
+tests: []
+test_file_path: ""
+file_path: "python/functions/datascience/datascience.py"
+---
+
+## Ejemplo
+
+```python
+impute([1.0, None, 3.0, float('nan'), 5.0])
+# [1.0, 3.0, 3.0, 3.0, 5.0]
+```
+
+## Notas
+
+Detecta tanto None como float('nan'). Si no hay valores validos, rellena con 0.0.