Add :clear to the tag values for report transactions

Part of STF-190. The `clear` tag retracts a previously reported fraud
report tag on a transaction, restoring its label to "unknown" (distinct
from the positive `:not_fraud` signal). Backend support shipped in
STF-15; this adds SDK support.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: oschwald

CHANGELOG.md

@@ -8,6 +8,8 @@
   for explicit device linking.
 * Added the processors `:banquest`, `:fat_zebra`, `:summit_payments`, and
   `:yaadpay` to `Minfraud::Components::Payment`.
+* Added `:clear` to the valid values for the `tag` attribute on
+  `Minfraud::Components::Report::Transaction`.
 * Unnecessary files were removed from the published .gem.
 
 ## v2.9.0 (2025-11-20)

lib/minfraud/components/report/transaction.rb

@@ -23,13 +23,13 @@ class Transaction < Base
         # A symbol indicating the likelihood that a transaction may be
         # fraudulent.
         #
-        # This may be one of +:chargeback+, +:not_fraud+, +:spam_or_abuse+, or
-        # +:suspected_fraud+.
+        # This may be one of +:chargeback+, +:clear+ (to retract a previous
+        # report), +:not_fraud+, +:spam_or_abuse+, or +:suspected_fraud+.
         #
         # @!attribute tag
         #
         # @return [Symbol, nil]
-        enum_accessor :tag, %i[chargeback not_fraud spam_or_abuse suspected_fraud]
+        enum_accessor :tag, %i[chargeback clear not_fraud spam_or_abuse suspected_fraud]
 
         # A string which is provided by your payment processor indicating the
         # reason for the chargeback.

spec/components/report/transaction_spec.rb

@@ -17,7 +17,7 @@
     end
 
     context 'with all valid tags' do
-      values = %i[chargeback not_fraud spam_or_abuse suspected_fraud]
+      values = %i[chargeback clear not_fraud spam_or_abuse suspected_fraud]
       values.each do |val|
         it "accepts #{val} as a valid tag" do
           result = described_class.new(tag: val)