🔧 chore: add nested path validation to skill-creator

- Added path validation to prevent .vibe/.vibe nested directory creation
- Enhanced BEST_PRACTICES.md with path handling patterns
- Added troubleshooting section to ADVANCED_FEATURES.md
- Shows actual creation path for transparency

Fixes: Issue with skills being created in incorrect nested paths
Refs: #skill-creation, #path-validation

.vibe/skills/skill-creator/references/BEST_PRACTICES.md

@@ -295,4 +295,31 @@ df = pl.read_csv("data.csv")
 ```
 
 For pandas compatibility, use the .to_pandas() method.
+```
+
+### ❌ Nested Path Creation
+**Issue**: Creating skills in incorrect nested paths like `.vibe/skills/.vibe/skills/skill-name`
+
+**Cause**: Script incorrectly appending base directory to target path
+
+**Solution**: Always use absolute paths and validate the final location
+
+```bash
+# Correct approach
+TARGET_DIR=".vibe/skills/$SKILL_NAME"
+mkdir -p "$TARGET_DIR"
+# Verify location
+ls -la ".vibe/skills/" | grep "$SKILL_NAME"
+```
+
+### ✅ Proper Path Handling
+```bash
+# Use absolute paths from project root
+SKILL_DIR="$PROJECT_ROOT/.vibe/skills/$SKILL_NAME"
+mkdir -p "$SKILL_DIR"
+# Validate no nested .vibe directories
+if [[ "$SKILL_DIR" == *".vibe/.vibe"* ]]; then
+    echo "Error: Nested .vibe path detected"
+    exit 1
+fi
 ```