✨ add Farming wiki page

Farming.md

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+# Farming
+
+> **Legend**
+> - ✅ Implemented — exists in the current codebase
+> - 🗺️ Planned — design exists but not yet implemented
+
+---
+
+## Farming Tools
+
+Player presses **F** to cycle through farming tools.
+
+| Tool | Action | Requirement | Cost |
+|------|--------|-------------|------|
+| `hoe` ✅ | Till soil | GRASS or DARK_GRASS, no obstacles | — |
+| `wheat_seed` ✅ | Plant wheat | TILLED_SOIL or WATERED_SOIL | 1 wheat_seed |
+| `carrot_seed` ✅ | Plant carrot | TILLED_SOIL or WATERED_SOIL | 1 carrot_seed |
+| `tree_seed` ✅ | Plant tree seedling | GRASS or DARK_GRASS | 1 tree_seed |
+| `water` ✅ | Water soil | TILLED_SOIL or WATERED_SOIL | — |
+
+---
+
+## Crops ✅
+
+| Crop | Stages | Time per stage | Watered | Yield |
+|------|--------|---------------|---------|-------|
+| Wheat | 3 | 20,000 ms | 2× faster | +3 wheat + 2 wheat_seed |
+| Carrot | 3 | 25,000 ms | 2× faster | +4 carrot + 1 carrot_seed |
+
+- Watering changes the tile to WATERED_SOIL, doubling growth speed.
+- At max stage (3), a villager (`farm` job, 1,200 ms) or player can harvest.
+- After harvest the tile reverts to TILLED_SOIL — ready to replant.
+
+---
+
+## Tree Seedlings ✅
+
+Planted with the `tree_seed` tool on GRASS or DARK_GRASS tiles. No interaction needed after planting.
+
+| Stage | Duration | Visual |
+|-------|----------|--------|
+| 0 | 60,000 ms | Sprout |
+| 1 | 60,000 ms | Sapling |
+| 2 | — | Converts automatically |
+
+At stage 2 the seedling auto-converts to a **FOREST tile** with a new tree resource (HP 3), which villagers can immediately chop.
+
+Total growth time: **~2 minutes**.
+
+Cannot plant on: occupied tiles, existing resources, buildings, crops, other seedlings.
+
+---
+
+← [[Game Systems Reference]]