feat: Add 6 new Claude Code skills

Skills added:
- 🔐 Secret Scanner: Detect leaked credentials in codebases
- 🏛️ Git Archaeologist: Analyze git history, find bugs
- 💾 Backup Automator: Automated encrypted cloud backups
- 🌐 Domain Manager: Unified DNS management
- 🔒 SSL Guardian: Certificate automation and monitoring
- 📡 Log Sentinel: Log analysis and anomaly detection

All skills include:
- SKILL.md with trigger patterns
- README.md with documentation
- GLM 5 attribution and disclaimer

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/ssl-guardian/SKILL.md

@@ -0,0 +1,37 @@
+---
+name: ssl-guardian
+description: Use this skill when the user asks to "setup SSL", "SSL certificate", "Let's Encrypt", "HTTPS", "certbot", "renew SSL", "certificate monitoring", "ssl expiration", or mentions managing SSL/TLS certificates.
+version: 1.0.0
+---
+
+# SSL Guardian Skill
+
+Automates SSL certificate management with Let's Encrypt, monitors expiration, and ensures auto-renewal.
+
+## What It Does
+
+1. **Certificate Issuance**: Automatic SSL from Let's Encrypt
+2. **Auto-Renewal**: Never let certificates expire
+3. **Expiration Monitoring**: Alert before certs expire
+4. **Wildcard Support**: *.domain.com certificates
+
+## Quick Start
+
+```bash
+# Install certbot
+sudo apt install -y certbot python3-certbot-nginx
+
+# Get certificate (nginx)
+sudo certbot --nginx -d example.com -d www.example.com
+
+# Test renewal
+sudo certbot renew --dry-run
+```
+
+## Usage
+
+```
+"Setup SSL certificate for example.com"
+"Get wildcard certificate for *.domain.com"
+"Check when my SSL certificate expires"
+```