TWAP oracle primitive with ring buffer, cumulative accumulator,
VWAP, deviation signals, and realized volatility. DCA executor
composes oracle with MycoSystem for time-spread purchases with
fixed and TWAP-aware chunk sizing strategies. Oracle integration
is opt-in via MycoSystemConfig.twap_oracle_params.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
