docs(aws-serverless): Backport improved troubleshooting execution guide

[vishalsatam]

Backport changes from aws/aws-durable-execution-docs#161 to the agent-plugins repo.
Improvements include:

• ARN-based workflow instead of separate function name + execution ID
• Alias resolution and list executions step
• Console link generation for visual debugging
• Structured output format with clear diagnosis summaries
• CloudWatch Logs querying when execution history is insufficient
• Additional usage examples covering failure scenarios
• Better error handling guidance (execution not found, permissions)
• Expanded trigger keywords in SKILL.md for better routing

Closes aws/aws-durable-execution-docs#162

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[bchampp]

I think we might consider adding a little more explicit instructions in the "Identify the root cause". From the original GitHub issue:

Key events to look for:

• CallbackTimedOut — timeout fired but may not have been caught
• ContextFailed — child context threw an unhandled error
• ExecutionFailed — entire execution crashed
• CallbackStarted with Timeout field — confirms timeout was registered

What do you think? Right now we're relying on the agents ability to interpret these history events but I think we can provide clearer guidance.

[vishalsatam]

I think we might consider adding a little more explicit instructions in the "Identify the root cause". From the original GitHub issue:

Key events to look for:

• CallbackTimedOut — timeout fired but may not have been caught
• ContextFailed — child context threw an unhandled error
• ExecutionFailed — entire execution crashed
• CallbackStarted with Timeout field — confirms timeout was registered

What do you think? Right now we're relying on the agents ability to interpret these history events but I think we can provide clearer guidance.

I updated the commit to include details for the failure type of events.

[vishalsatam]

@scottschreckengaust @theagenticguy @krokoko , can you please review this pull request? If you approve, please merge as well since I don't have permissions.