Add 1350 checkpoint and Great Khanate internal fractures

1350 Black Death consequences:
- Song: moderate demographic hit but severe political "Mandate" crisis
- SE Asia: catastrophic depopulation, Chinese settlers fill vacuum
- Great Khanate: economic crisis → disastrous policies → northern Silk Road dies
- Germany: independence movement triggered by tribute demands
- Ilkhanate: survives, gains trade monopoly as routes shift south
- Italy: becomes Europe's new eastern trade gateway

Great Khanate internal fractures (new section):
- Post-plague economic transformation: trade empire → serfdom empire
- Rus identity fragments into 5+ distinct groups
- Novgorod divergence: economic reorientation toward Germany, religious split
- Religious schism: Volga Mongolized Orthodoxy vs Constantinople Orthodoxy
- Agricultural pivot: Mongol landlords + Slavic serfs in Ukraine/Hungary

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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