Combat Log shows undiscovered mechs

I'm playing the campaign, the log shows yet-to-be-discovered enemy mechs cover, guarded, entrenched status etc.

Start by reproducing the campaign Combat Log behavior described in the issue, focusing on entries for enemy mechs that have not yet been discovered. Trace where the log determines and displays cover, guarded, and entrenched status, then verify that undiscovered mechs no longer reveal those details while discovered mechs remain unaffected.

Written by the indexing model from the issue text.