Add Kiro steering files, hooks, and scripts (#812)

Co-authored-by: Sungmin Hong <hsungmin@amazon.com>

.kiro/steering/review-mode.md

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+---
+inclusion: manual
+description: Code review mode context for thorough quality and security assessment
+---
+
+# Review Mode
+
+Use this context when conducting code reviews or quality assessments.
+
+## Review Process
+
+1. Gather context — Check git diff to see all changes
+2. Understand scope — Identify which files changed and why
+3. Read surrounding code — Don't review in isolation
+4. Apply review checklist — Work through each category
+5. Report findings — Use severity levels
+
+## Review Checklist
+
+### Correctness
+- Does the code do what it's supposed to do?
+- Are edge cases handled properly?
+- Is error handling appropriate?
+
+### Security
+- Are inputs validated and sanitized?
+- Are secrets properly managed?
+- Are there any injection vulnerabilities?
+- Is authentication/authorization correct?
+
+### Performance
+- Are there obvious performance issues?
+- Are database queries optimized?
+- Is caching used appropriately?
+
+### Maintainability
+- Is the code readable and well-organized?
+- Are functions and classes appropriately sized?
+- Is there adequate documentation?
+- Are naming conventions followed?
+
+### Testing
+- Are there sufficient tests?
+- Do tests cover edge cases?
+- Are tests clear and maintainable?
+
+## Severity Levels
+
+- **Critical**: Security vulnerabilities, data loss risks
+- **High**: Bugs that break functionality, major performance issues
+- **Medium**: Code quality issues, maintainability concerns
+- **Low**: Style inconsistencies, minor improvements
+
+## Invocation
+
+Use `#review-mode` to activate this context when reviewing code.