feat: add aws-dev-toolkit plugin

[rsmets]

Summary

Adds aws-dev-toolkit — a comprehensive AWS development plugin with:

• 25 skills covering architecture design, cost optimization, security review, IaC scaffolding, cloud migration (GCP/Azure → AWS), and individual AWS service deep-dives (Lambda, ECS, EKS, DynamoDB, S3, IAM, CloudFront, API Gateway, Step Functions, networking, messaging, observability)
• 11 specialized agents (Well-Architected reviewer, cost optimizer, migration advisor, Bedrock SME, AgentCore SME, container SME, serverless SME, networking SME, observability SME, IaC reviewer, AWS explorer)
• 5 MCP servers (aws-iac, aws-docs, aws-core, aws-cost, aws-well-architected) via awslabs MCP server packages
• Challenger skill — adversarial reviewer that stress-tests other agents' outputs before presenting recommendations

RFC: #108

Plugin Details

Field	Value
Name	aws-dev-toolkit
Skills	25
Agents	11
MCP Servers	5
License	Apache-2.0

Skills Breakdown

Infrastructure & Architecture: aws-architect, well-architected, customer-ideation, iac-scaffold, aws-debug, security-review

Cost & Optimization: cost-check, bedrock-cost

AI/Agent Development: strands-agent, challenger

AWS Services: lambda, ec2, ecs, eks, s3, dynamodb, api-gateway, cloudfront, iam, networking, messaging, observability, step-functions

Cloud Migration: gcp-to-aws, azure-to-aws

Test Plan

• Verify plugin installs via claude --plugin-dir ./plugins/aws-dev-toolkit
• Validate all SKILL.md frontmatter passes CI checks
• Validate all agent .md frontmatter passes CI checks
• Confirm MCP servers start successfully with uvx
• Test representative skills trigger correctly based on context

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