Add virtual environment setup and minimal dependencies (#149)

## Changes
- Add virtual environment setup instructions to all docs
- Create requirements.txt with minimal dependencies (13 packages)
- Make anthropic optional (only needed for API enhancement)
- Clarify path notation (~ = $HOME, /Users/yourname examples)
- Add venv activation reminders throughout documentation

## Files Changed
- README.md: Added venv setup section to CLI method
- BULLETPROOF_QUICKSTART.md: Replaced Step 4 with venv setup
- CLAUDE.md: Updated Prerequisites with venv instructions
- requirements.txt: Created with minimal deps (requests, beautifulsoup4, pytest)

## Why
- Prevents package conflicts and permission issues
- Standard Python development practice
- Enables proper pytest usage without pipx complications
- Makes setup clearer for beginners

README.md

@@ -149,11 +149,40 @@ Package skill at output/react/
 
 ### Method 2: CLI (Traditional)
 
+#### One-Time Setup: Create Virtual Environment
+
+```bash
+# Clone repository
+git clone https://github.com/yusufkaraaslan/Skill_Seekers.git
+cd Skill_Seekers
+
+# Create virtual environment
+python3 -m venv venv
+
+# Activate virtual environment
+source venv/bin/activate  # macOS/Linux
+# OR on Windows: venv\Scripts\activate
+
+# Install dependencies
+pip install requests beautifulsoup4 pytest
+
+# Save dependencies
+pip freeze > requirements.txt
+
+# Optional: Install anthropic for API-based enhancement (not needed for LOCAL enhancement)
+# pip install anthropic
+```
+
+**Always activate the virtual environment before using Skill Seeker:**
+```bash
+source venv/bin/activate  # Run this each time you start a new terminal session
+```
+
 #### Easiest: Use a Preset
 
 ```bash
-# Install dependencies (macOS)
-pip3 install requests beautifulsoup4
+# Make sure venv is activated (you should see (venv) in your prompt)
+source venv/bin/activate
 
 # Optional: Estimate pages first (fast, 1-2 minutes)
 python3 cli/estimate_pages.py configs/godot.json