chore: sync .cursor/ directory with latest agents, commands, and skills

- Sync 13 agent files with updated descriptions and configurations
- Sync 23 command files with latest YAML frontmatter and content
- Sync 7 skill SKILL.md files with proper YAML frontmatter quoting
- Copy missing cpp-testing and security-scan skills to .cursor/
- Fix integration tests: send matching input to blocking hook test and
  expect correct exit code 2 (was 1)

.cursor/commands/code-review.md

@@ -9,7 +9,7 @@ Comprehensive security and quality review of uncommitted changes:
 **Security Issues (CRITICAL):**
 - Hardcoded credentials, API keys, tokens
 - SQL injection vulnerabilities
-- XSS vulnerabilities
+- XSS vulnerabilities  
 - Missing input validation
 - Insecure dependencies
 - Path traversal risks