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/agents/database-reviewer.md

@@ -1,8 +1,8 @@
 ---
 name: database-reviewer
 description: PostgreSQL database specialist for query optimization, schema design, security, and performance. Use PROACTIVELY when writing SQL, creating migrations, designing schemas, or troubleshooting database performance. Incorporates Supabase best practices.
-model: anthropic/claude-opus-4-5
-readonly: false
+tools: ["Read", "Write", "Edit", "Bash", "Grep", "Glob"]
+model: sonnet
 ---
 
 # Database Reviewer