NVIDIA / holodeck / 21984397574

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feat(aws): add AMI architecture detection and cross-validation

Add describeImageArch helper to query an AMI's architecture from EC2
and getInstanceTypeArch to query instance type supported architectures.
Update resolveImageForNode to return architecture for all code paths
including explicit ImageId. Cross-validate AMI architecture against
instance type supported architectures in DryRun() to catch mismatches
(e.g., arm64 AMI + x86_64 instance type) with a clear error message
before instance creation fails.

Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

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