Adds `interpose`, the share of the fire aimed at our other machines that a hex stands in front of, weighted by each enemy's expected damage. `Screen` now scores with it and becomes an override profile; its weighting is its own rather than a stand-in. Co-Authored-By: Claude Code <noreply@anthropic.com> Change-Id: I8be87a47ad781c84c1100eab427e3608f7b1ba10