Add 1625 checkpoint: economic shockwave, Americas, Egypt expansion, global survey

Economic shockwave from Song split:
- Global industrial goods supply dropped 40-60%
- Ilkhanate surpasses Song as #1 industrial producer (~1620s)
- Germany/Bohemia/Portugal/Italy fill European vacuum
- Industrial production permanently multipolarized

Americas detailed: Portuguese empire (Mexico, Peru, Brazil, Caribbean), Castile (secondary),
Kalmar Vinland (225yr fishing/trade settlements), French/English (early), German (growing)

Egypt dual expansion: Red Sea → East African colonization + westward Sunni alliance building
Independence trajectory: economic base + diplomatic network → formal break ~1650-1700

Japan: isolation + Hokkaido colonization
India: unified, economic dependency shifted from Song to Ilkhanate
Mongol Khanate: nationalized Song mines, modest industry, reached Bering Strait
Great Khanate: reform failing, serfdom blocks industrialization, Ukraine famines
North-South Song: active Three Kingdoms-intensity war along Yangtze line

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

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