Add 1500 checkpoint: revised industrialization spectrum, Song stabilization details

Song crisis resolution:
- Eastern Han model: military clans control court, civilian govt hollowed out
- Population redistribution reduces N-S divide but landlord system + military politics unresolved
- Innovation plateauing — no external competitive pressure drives stagnation
- Future Three Kingdoms/Five Dynasties fragmentation risk remains

Industrialization spectrum revised:
- Song (mature but slowing), Ilkhanate (early/cities), Mongol Khanate (resource-extraction)
- Germany (proto-industrial), India (being de-industrialized), Great Khanate (blocked by serfdom)
- Key insight: Song's slowdown means others can catch up → balanced V3 game

New developments:
- Ilkhanate bypasses Song to trade directly with Japan via Indonesia
- Mongol Khanate inadvertently industrializing through Song economic colonization
- Columbus discovers Americas (~1490s) under Portuguese flag
- Reformation approaching formal break (~early 1500s)
- Song southern refugees begin settling Australia

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

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