When a filter processor rejects a message (filterMatched=false) or an idempotent consumer detects a duplicate (duplicateMessage=true), the compound container turns amber (header, border, body tint). Also adds red pulsing rings on the failed processor badge (same SMIL pattern as the teal hasTraceData pulse). Backend: ProcessorNode gains filterMatched/duplicateMessage fields, threaded from ProcessorExecution JSON path. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>