split data in separate files

docs/schemas/production-chain.md

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+# Schema: ProductionChain
+
+**Entity Type:** `ProductionChain`
+
+## Fields
+
+| Field | Type | Notes |
+|------|------|------|
+| id | string | stable anchor id |
+| name | string | chain name |
+| steps | array | `{ building, in[], out[], cycleSeconds }` |
+| recommendedRatios | array | `{ building, count }` |
+| bottlenecks | array | goods/buildings that commonly limit throughput |
+| notes | string | general guidance |