split data in separate files

docs/buildings/sawmill.md

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+# Sawmill
+
+**Entity Type:** Building
+
+## Properties
+
+| Field | Value |
+|-------|-------|
+| Category | Production / Construction Materials |
+| Required Tier | [Tier I](../population-tiers/tier-i.md) |
+| Construction Time | Instant |
+| Cycle Time | 30 seconds |
+
+## Description
+
+Converts Logs to Timber planks.
+
+## Costs
+
+**Build Cost:** 2 Timber
+
+**Maintenance:** -5 gold/min, 2 Tier I workers
+
+## Placement
+
+| Requirement | Value |
+|-------------|-------|
+| Road Required | Yes |
+| Warehouse Required | Yes |
+| Constraints | None special (but requires logistics) |
+
+## Production
+
+**Input:** Logs
+
+**Output:** [Timber](../goods/timber.md)
+
+## Production Chain
+
+[Timber Chain](../production-chains/timber.md)
+
+## Usage Patterns
+
+Pair 1:1 with Woodcutters (matching 30s cycles).
+
+## Common Pitfalls
+
+Too many sawmills leads to upkeep drain without benefit.