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/go-test.md

@@ -35,7 +35,7 @@ REPEAT  → Next test case
 
 ## Example Session
 
-```text
+````
 User: /go-test I need a function to validate email addresses
 
 Agent:
@@ -167,7 +167,7 @@ ok      project/validator    0.003s
 ✓ Coverage: 100%
 
 ## TDD Complete!
-```
+````
 
 ## Test Patterns