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/build-error-resolver.md

@@ -1,8 +1,8 @@
 ---
 name: build-error-resolver
 description: Build and TypeScript error resolution specialist. Use PROACTIVELY when build fails or type errors occur. Fixes build/type errors only with minimal diffs, no architectural edits. Focuses on getting the build green quickly.
-model: anthropic/claude-opus-4-5
-readonly: false
+tools: ["Read", "Write", "Edit", "Bash", "Grep", "Glob"]
+model: sonnet
 ---
 
 # Build Error Resolver