Port the C# regression algorithm demonstrating IndicatorVolatilityModel
usage, including how to reset and warm up the indicator on splits and
dividends to avoid volatility jumps from price discontinuities, and
enable the Python variant in the regression test suite.
Closes#6375
Claude-Session: https://claude.ai/code/session_01R7LGdW3eC9za8WMrtssHGr
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
jonathanwu906