split data in separate files

docs/population-tiers/tier-ii.md

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+# Tier II - Plebeians (Latium) / Mercators or Smiths (Albion)
+
+**Entity Type:** PopulationTier
+
+## Stats
+
+| Field | Value |
+|-------|-------|
+| Workforce Fraction | 30% |
+
+## Notes
+
+Tier II introduces major upkeep spikes (mills/bakeries/bricks, etc.).
+
+## Common Pitfalls
+
+Overbuilding production buildings drains gold via maintenance.
+
+## Related
+
+- [Garum](../goods/garum.md) - Food need (Latium)
+- [Bread Chain](../production-chains/bread.md) - Key production chain