fix: Rubocop offenses

          # The context prefix that Labkit::Context applies to every field it

          # stores (see Labkit::Context::LOG_KEY). Any deprecated field with

          # this prefix is by convention a context field — owned by whichever

          # provider populates the context (e.g. ApplicationContext) — even

          # this prefix is by convention a context field, owned by whichever

          # provider populates the context (e.g. ApplicationContext), even

          # when a particular log call happens to pass it directly. Lazily

          # built so the constant is not referenced at load time.

          def context_field_prefix

              standard_field = deprecated_lookup[key_str]

              next unless standard_field

              # context_prefix is the Labkit::Context namespace — the field is conceptually

              # context_prefix is the Labkit::Context namespace. The field is conceptually

              # context-owned even if the caller happens to pass it directly. Otherwise

              # use direct-vs-context based on whether the caller actually included it.

              if direct_keys.include?(key_str) && !key_str.start_with?(context_prefix)