fix: add input validation to event emitter + add test report

- archeflow-event.sh: validate JSON data and parent format before processing
- docs/test-report: 42/42 tests passed across all 8 lib scripts

lib/archeflow-event.sh

@@ -45,11 +45,20 @@ fi
 
 TS=$(date -u +%Y-%m-%dT%H:%M:%SZ)
 
+# Validate JSON data
+if ! echo "$DATA" | jq empty 2>/dev/null; then
+  echo "Error: invalid JSON in data argument: $DATA" >&2
+  exit 1
+fi
+
 # Build parent array from comma-separated seq numbers
 if [[ -z "$PARENT_RAW" ]]; then
   PARENT_JSON="[]"
-else
+elif [[ "$PARENT_RAW" =~ ^[0-9]+(,[0-9]+)*$ ]]; then
   PARENT_JSON="[${PARENT_RAW}]"
+else
+  echo "Error: invalid parent format (expected comma-separated integers): $PARENT_RAW" >&2
+  exit 1
 fi
 
 # Construct the event using jq for reliable JSON assembly