* fix(correlation): normalize escalation signals to ISO2 country codes
Protests used full names ("Iran") while news clusters used ISO2 ("IR"),
causing clusterByCountry() to produce duplicate rows. All signal sources
now normalize via normalizeToCode() before clustering. generateTitle()
resolves codes back to full names for display.
* test(correlation): add behavioral tests for escalation country normalization
Suite B: mocked geometry, tests collectSignals normalizes "Iran" to "IR",
generateTitle shows full names, and mixed-format signals share same code.
* fix(correlation): resolve aliases before 2-char fast path in normalizeToCode
nameToCountryCode() now runs first so two-letter aliases like UK resolve
to their canonical ISO2 code (GB) instead of being returned verbatim.
Adds static test for resolution order and behavioral test for UK->GB.
11a0323fdc