🌙 Add overnight automation script

- Autonomous generation of remaining 384 assets
- 60s rate limiting between assets
- Auto-commits every 20 assets
- Estimated 6.4 hours runtime
- Full documentation in OVERNIGHT_GENERATION.md

Ready to run: nohup python3 scripts/generate_overnight.py > overnight_production.log 2>&1 &

OVERNIGHT_GENERATION.md

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+# 🌙 OVERNIGHT ASSET GENERATION
+
+## Quick Start
+
+```bash
+# Run in background overnight
+cd /Users/davidkotnik/repos/novafarma
+nohup python3 scripts/generate_overnight.py > overnight_production.log 2>&1 &
+
+# Check progress
+tail -f overnight_production.log
+
+# Check how many done
+find assets/images -name "*.png" | wc -l
+```
+
+## What It Does
+
+- ✅ Generates ALL remaining assets from registry
+- ✅ Rate limited: 60s between each asset
+- ✅ Auto-commits every 20 assets
+- ✅ Runs autonomously in background
+- ✅ Logs everything to `overnight_production.log`
+
+## Details
+
+- **Total assets**: 422
+- **Already done**: ~38
+- **Remaining**: ~384
+- **Estimated time**: ~6.4 hours (384 × 60s)
+
+## Style
+
+All assets use approved **Dark Hand-Drawn 2D Stylized Indie** style:
+- Bold thick black outlines
+- Exaggerated proportions
+- Green chroma key background
+- Mature 90s cartoon aesthetic
+
+## Monitor Progress
+
+```bash
+# Watch live log
+tail -f overnight_production.log
+
+# Count generated files
+find assets/images -name "*.png" | wc -l
+
+# Check git commits
+git log --oneline | head -10
+```
+
+## Stop If Needed
+
+```bash
+# Find process
+ps aux | grep generate_overnight
+
+# Kill it
+kill <PID>
+```
+
+---
+
+**Let it run overnight and wake up to 422 complete game assets!** 🌙✨