feat(aws-observability): add aws-observability power

[gcacace]

Description of changes:

This PR introduces the AWS Observability Power, a comprehensive observability platform that integrates CloudWatch Logs, Metrics, Alarms, Application Signals (APM), CloudTrail security auditing, and AWS Documentation access into a unified Kiro power.

Key Components:

1. Power Configuration (POWER.md)

   • Comprehensive documentation covering all observability capabilities
   • Integration of 4 MCP servers: CloudWatch, Application Signals, CloudTrail, and AWS Documentation
   • Detailed setup instructions with prerequisites and configuration examples
   • Quick start examples and common workflow patterns

2. MCP Server Configuration (mcp.json)

   • CloudWatch MCP server for logs, metrics, and alarms
   • Application Signals MCP server for APM and distributed tracing
   • CloudTrail MCP server for security auditing
   • AWS Documentation MCP server for reference access
   • Configurable AWS profile and region settings

3. Steering Files (6 comprehensive guides):

   • incident-response.md - Complete incident response framework with 6 phases (detection, investigation, mitigation, recovery, RCA, postmortem)
   • alerting-setup.md - Intelligent alarm configuration with recommended thresholds and best practices
   • application-signals-setup.md - Application Signals enablement guide and setup workflows
   • log-analysis.md - CloudWatch Logs Insights query patterns and syntax reference
   • performance-monitoring.md - Application Signals APM monitoring, SLO management, and trace analysis
   • security-auditing.md - CloudTrail security monitoring, compliance auditing, and incident investigation

Features:

• Unified observability across logs, metrics, traces, and security events
• Automated pattern detection and anomaly analysis
• SLO-based monitoring and alerting
• Comprehensive incident response workflows
• Security auditing and compliance tracking
• Integration patterns for correlating multiple data sources

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