Run AWS Rekognition boto3 calls off the event loop

[groupthinking]

Move all boto3 Rekognition and local image reads for analysis off the event loop to keep WebSocket and health tasks responsive.

[linear-code]

GRV-234

[github-actions]

👋 Thanks for opening this issue! It has been automatically labeled for triage.

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• perf(cloud-ai): AWS Rekognition blocks the event loop on 14 synchronous boto3 calls #1204

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[groupthinking]

Closing as a duplicate of #1204, completed by merged PR #1205. Exact merged repair 823b4695730d693321539cdad7d128a56c883a30 moves all blocking Rekognition SDK calls and local image reads off the event loop with per-operation regression coverage.