Revert "Add Kiro IDE support (.kiro/) (#548)"

This reverts commit ce828c1c3c.

.kiro/steering/performance.md

@@ -1,54 +0,0 @@
----
-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