fix: 9 improvements to aws-devops-agent power from end-to-end testing

[tipuq]

Summary

9 defects fixed from end-to-end testing against the live AWS MCP Server.

§	Severity	Fix
1	High	Replace import boto3 with call_boto3 — sandbox blocks raw imports
2	High	Add userId/userType to all CreateChat + SendMessage examples
3	Medium	Empty list-recommendations recovery via update-backlog-task --task-status PENDING_START
4	Medium	Reducing Approval Fatigue section (autoApprove list, trade-off guide)
5	Low	15 resource-type keywords (ec2, lambda, ecs, ssm, kms, etc.)
6	Low	Concrete --starting-token / --page-size pagination example
7	Low	Worked ECS incident walkthrough
8	Low	1b. Required IAM Permissions in Setup
9	Low	User identity troubleshooting as 3 numbered options

Validation

• 42-point automated checklist: all pass
• All external URLs verified (HTTP 200)
• No import boto3 in any code block
• Every create-chat has --user-id/--user-type
• License: AWS Customer Agreement (repo convention)

[github-actions]

Hi @tipuq, thank you for your contribution!

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