Add post-Timur partition, SE Asian empire structure, Australia, Western Protectorate

Post-Timur Central Asian partition (~1410-1430):
- Great Khanate recovers Kazakhstan steppe + W. Siberia (to Syr Darya line)
- Ilkhanate absorbs Khorasan + W. Afghanistan
- Khoqand Khanate (Timurid remnant) holds Transoxiana
- Timurid-Indian dynasty in N. India (proto-Mughal)
- Eastern Chagatai remnant in western Xinjiang

Song Western Protectorate (西域都护府):
- Eastern Xinjiang as military governor fiefdoms
- Redirects northern military officials to frontier (eases internal tension)
- Tang Anxi precedent acknowledged, checks implemented

Song SE Asian Empire (5-tier system):
- Tier 1: Vietnam, Burma, Malacca (direct provinces)
- Tier 2: Xuanweisi (key ports, resource zones)
- Tier 3: Autonomous Chinese polities (Borneo, Sumatra, Philippines)
- Tier 4: Tributary kingdoms (Siam, Khmer)
- Tier 5: Trading posts (Moluccas, N. Australia)

Australia discovered ~1400, iron ore impact is V3-era issue
Northern Silk Road confirmed dead, trade route table updated

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

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