Add 1325 developments: trade routes, India, Tibet, Japan, SE Asia

- Hexi Corridor confirmed as Song territory (direct Silk Road access)
- Complete trade route map: 4 routes, Ilkhanate profits from 3, Mongol Khanate excluded from all
- Song SE Asian colonization: layered system (xuanweisi → trading posts → settler polities → tributaries)
- Japan: silver island, no Mongol invasion, less centralized but economically important
- Korea: Song tributary state
- India: Delhi Sultanate, Chagatai pressure manageable, Song economic penetration beginning
- Tibet: independent, low Song priority
- Mongol Khanate: fully marginalized, future economic semi-colony
- Great Khanate Orthodoxy: Mongolized sect, rejects Constantinople authority
- Little Ice Age effects: accelerates Song southern crisis and SE Asian colonization

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

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