Fix achievement progression by moving Whispering Woods unlock

🎯 Achievement System Improvements:
- Pet Collector achievement (5 pets) now unlocks Whispering Woods
- Nature Explorer achievement (3 Grass species) no longer unlocks location
- Added 2 new Grass-type pets: Vinewrap and Bloomtail
- Updated Whispering Woods spawns to include new Grass pets

🐛 Problem Solved:
- Broke the catch-22 where players needed achievements to access locations
- But needed species from those locations to earn achievements
- Now players can progress naturally: 5 pets → Whispering Woods → more Grass species

🆕 New Pets:
- Vinewrap (Grass) - Defensive grass pet with vine abilities
- Bloomtail (Grass) - Fast grass pet with flower-based attacks

🔧 Updated Spawns:
- Whispering Woods: 3 Grass species (Leafy, Vinewrap, Bloomtail) + rare Flamey
- Players can now complete Nature Explorer achievement after accessing Whispering Woods

📚 Documentation:
- Updated README with new achievement progression
- Clarified unlock sequence and achievement relationships

This change makes the game progression much more logical and accessible for new players.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -96,12 +96,17 @@ A feature-rich IRC bot that brings Pokemon-style pet collecting and battling to
 
 ### Unlocking Locations
 Locations are unlocked by completing achievements:
-- **Nature Explorer**: Catch 3 different Grass-type pets → Whispering Woods
+- **Pet Collector**: Catch 5 pets total → Whispering Woods
 - **Spark Collector**: Catch 2 different Electric-type pets → Electric Canyon
 - **Rock Hound**: Catch 3 different Rock-type pets → Crystal Caves
 - **Ice Breaker**: Catch 5 different Water/Ice-type pets → Frozen Tundra
 - **Dragon Tamer**: Catch 15 pets total + 3 Fire-types → Dragon's Peak
 
+### Achievement Progression
+- **Pet Collector** (5 pets) → Unlock Whispering Woods
+- **Nature Explorer** (3 different Grass pets) → No location unlock
+- **Advanced Trainer** (10 pets) → No location unlock
+
 ## 🌤️ Weather System
 
 ### Weather Types & Effects