split data in separate files

docs/schemas/building.md

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+# Schema: Building
+
+**Entity Type:** `Building`
+
+## Fields
+
+| Field | Type | Notes |
+|------|------|------|
+| id | string | stable anchor id |
+| name | string | display name |
+| category | string | Production / Service / Safety / Monument / etc. |
+| description | string | 1-2 lines max |
+| region | string | Latium / Albion (if region-specific) |
+| requiredPopulationTier | string | link to tier |
+| buildCost | object | `{ gold?, goods[] }` |
+| constructionTime | string | usually instant per research |
+| maintenance | object | `{ goldPerMin?, workforce[] }` |
+| workforce | array | `[{ tier, count }]` |
+| dimensions | string | base size, size with roads |
+| placementConstraints | array | coast/marsh/forest/fields/etc |
+| roadRequired | boolean | |
+| warehouseRequired | boolean | implies "in range of Warehouse/Trading Post" |
+| aqueductSupport | boolean | can be improved with aqueduct connection |
+| inputGoods | array | links to goods |
+| outputGoods | array | links to goods |
+| cycleTimeSeconds | number | production cycle time |
+| areaEffects | array | `{ type, value, target, radius? }` |
+| productionChain | array | links to chain(s) |
+| unlockCondition | string | tier, research, count, etc |
+| specialists | array | compatible specialists with their effects |
+| usagePatterns | string | short |
+| commonPitfalls | string | short |