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

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

.kiro/steering/performance.md

@@ -0,0 +1,54 @@
+---
+inclusion: auto
+description: Performance optimization guidelines including model selection strategy, context window management, and build troubleshooting
+---
+
+# Performance Optimization
+
+## Model Selection Strategy
+
+**Claude Haiku 4.5** (90% of Sonnet capability, 3x cost savings):
+- Lightweight agents with frequent invocation
+- Pair programming and code generation
+- Worker agents in multi-agent systems
+
+**Claude Sonnet 4.5** (Best coding model):
+- Main development work
+- Orchestrating multi-agent workflows
+- Complex coding tasks
+
+**Claude Opus 4.5** (Deepest reasoning):
+- Complex architectural decisions
+- Maximum reasoning requirements
+- Research and analysis tasks
+
+## Context Window Management
+
+Avoid last 20% of context window for:
+- Large-scale refactoring
+- Feature implementation spanning multiple files
+- Debugging complex interactions
+
+Lower context sensitivity tasks:
+- Single-file edits
+- Independent utility creation
+- Documentation updates
+- Simple bug fixes
+
+## Extended Thinking
+
+Extended thinking is enabled by default in Kiro, reserving tokens for internal reasoning.
+
+For complex tasks requiring deep reasoning:
+1. Ensure extended thinking is enabled
+2. Use structured approach for planning
+3. Use multiple critique rounds for thorough analysis
+4. Use sub-agents for diverse perspectives
+
+## Build Troubleshooting
+
+If build fails:
+1. Use build-error-resolver agent
+2. Analyze error messages
+3. Fix incrementally
+4. Verify after each fix