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Bug: S3 ARN parsing accepts invalid FIPS regions, missing fields, and malformed Outpost ARNs

Bug: S3 ARN parsing accepts invalid FIPS regions, missing fields, and malformed Outpost ARNs: a task in LegoFlow-SWE (Harbor dataset). When working with S3 Access Point and Outpost ARNs, the ARN parsing logic does not properly validate or reject several invalid inputs. This leads to silent…

The task

When working with S3 Access Point and Outpost ARNs, the ARN parsing logic does not properly validate or reject several invalid inputs. This leads to silent acceptance of ARNs that should be treated as invalid, causing downstream failures or incorrect resource resolution.

Part of Lego-X/LegoFlow-SWE.