Crosstalk

Contract crosstalk. Extends Contract with:

Member	Returns	Meaning
.input_x	string	First intercepted signal: letters with 0s and 1s scattered through; some bits are decoys
.input_y	string	Second intercepted signal, same shape
.min_length	number	Minimum palindrome length for a bit to count: a bit qualifies only if the letters mirror to this span centred on it

Approach: in each signal, keep only bits sitting at the center of a letter palindrome of at least min_length; combine the two recovered bitstreams per the briefing and transmit.