• [Enhancement] Optimize Node#deep_dup to reduce array allocations during configuration deep copying.
• [Enhancement] Optimize Result#initialize to use shared EMPTY_HASH constant for successful validations.
• [Enhancement] Optimize StatisticsDecorator#append string concatenation to reduce allocations.
• [Enhancement] Optimize Notifications#instrument payload handling to avoid unnecessary hash merges for empty payloads.
• [Change] Remove Ruby 3.1 support due to EOL.