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* feat(s3): add TagUser, UntagUser, ListUserTags IAM actions Adds AWS IAM-compatible user tag operations on the embedded IAM endpoint. Tags persist in the Identity proto as a repeated UserTag field; the existing 50-tag / 128-byte-key / 256-byte-value AWS limits are enforced. Pagination is stubbed (IsTruncated=false) since the 50-tag cap means all tags fit in a single response. * review: validate UntagUser TagKeys entries parseTagKeysParams now rejects empty keys and keys past MaxUserTagKeyLength; UntagUser additionally requires at least one TagKeys.member.N entry to match AWS validation behavior. * review: pre-allocate user-tag merge and filter slices mergeUserTags now allocates the combined existing+incoming capacity up front; UntagUser builds the filtered slice via make with the full ident.Tags capacity instead of ident.Tags[:0:0], which forced a reallocation on every append. * review: cover duplicate-in-request and invalid TagKeys cases Regression tests assert TagUser rejects two members with the same key in one request, and UntagUser rejects missing/empty/oversized TagKeys entries.