Added physical, faction-specific rival scouting

I replaced shared starting knowledge with physical rival scouting. A faction learns about a player contact when its own scout reaches a position where that contact can be observed.

Each rival keeps its own contact list. Discoveries no longer automatically appear in another faction's knowledge, and the scout has to travel through the actual world rather than receiving an unexplained global reveal.

“Rivals learn player contacts through actual scouts rather than starting with shared knowledge.”

The clips inspect a controlled rival scout after real pre-take travel and observation. Native evidence checks the discovering faction and the other factions separately. This is a location inspection after scouting, not a filmed raid or a natural encounter.