feat: import 35 skills from affaan-m/everything-claude-code

- Add 9 agent skills (cc-agent-*)
- Add 10 command skills (cc-cmd-*)
- Add 8 skill files (cc-skill-*)
- Add 8 rule skills (cc-rule-*)
- Update README.md skill count from 225 to 260
- Add new skills to Full Skill Registry
- Add credit to affaan-m in Credits section
- Regenerate skills_index.json

Source: https://github.com/affaan-m/everything-claude-code
Author attribution: affaan-m, version 1.0

skills/cc-rule-security/SKILL.md

@@ -0,0 +1,43 @@
+---
+name: cc-rule-security
+description: Security Guidelines
+author: affaan-m
+version: "1.0"
+---
+
+# Security Guidelines
+
+## Mandatory Security Checks
+
+Before ANY commit:
+- [ ] No hardcoded secrets (API keys, passwords, tokens)
+- [ ] All user inputs validated
+- [ ] SQL injection prevention (parameterized queries)
+- [ ] XSS prevention (sanitized HTML)
+- [ ] CSRF protection enabled
+- [ ] Authentication/authorization verified
+- [ ] Rate limiting on all endpoints
+- [ ] Error messages don't leak sensitive data
+
+## Secret Management
+
+```typescript
+// NEVER: Hardcoded secrets
+const apiKey = "sk-proj-xxxxx"
+
+// ALWAYS: Environment variables
+const apiKey = process.env.OPENAI_API_KEY
+
+if (!apiKey) {
+  throw new Error('OPENAI_API_KEY not configured')
+}
+```
+
+## Security Response Protocol
+
+If security issue found:
+1. STOP immediately
+2. Use **security-reviewer** agent
+3. Fix CRITICAL issues before continuing
+4. Rotate any exposed secrets
+5. Review entire codebase for similar issues