CalendarValueHistory() was called with no country filter at all, so
ANY country's economic calendar event vetoed a trade regardless of
relevance - a JPY release blocked a EURUSD trade just as readily as a
USD one, making NF_MinImpact's fine-tuning far noisier than intended.
Adds System/NewsRelevance.mqh (GetRelevantCountryCodes/
ImpactWeightedProximity), a shared utility that cross-references
CalendarCountries() against the symbol's base/quote currency to get
the actually-relevant ISO country codes, then uses
CalendarValueHistory()'s country_code-filtering overload. Shared so
the upcoming NN news-input feature reuses the same relevance logic
rather than duplicating it.
Compiled clean (MetaEditor, 0 errors/0 warnings).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
