Add 1400-1425 checkpoint: Timur aftermath, Columbus, Northern Ulus, European wars

Major developments:
- Timurid-Indian Empire: massive N. Indian state from Timur's conquests
- Northern Ulus (Novgorod Khanate): expansionist turn, Finland/Baltic conflicts with Kalmar
- Four-way Baltic rivalry: Kalmar vs Northern Ulus vs Germany vs France
- Greater Germany: constitutional crisis (monarchy vs republic), Italian rivalry with Aragon
- Plantagenet France: campaigns against Scotland/Ireland, Burgundy friction
- Zheng He-equivalent: private explorer maps E. Africa, confirms Australia
- Portugal accepts Columbus (~1490s): Indian Ocean blocked by Song/Ilkhanate → Atlantic pivot
- Americas become PORTUGUESE (not Spanish): massive colonial divergence
- Kalmar Union rediscovers Vinland via Norse route (~1400-1420s)
- Song/Ilkhanate early trading posts in India and East Africa
- Americas colonial landscape table: Kalmar (north), Portugal (Caribbean/S.America), France/Castile (later)

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

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