Emitter : MechWeapon -- energy-weapon (beam) base. Both surviving weapon leaves
(PPC.CPP, GAUSS.CPP/GaussRifle) derive from it and now compile against the real
base. Ctor chains MechWeapon + inits chargeLevel/dischargeTime; statics/dtor/test
real; FireWeapon (beam discharge) + CreateStreamedSubsystem staged. BT: 33 ok.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>