Build 0.7.6: Operational Soundscape & Melee Doctrine Update — War Room: Tactical Sandbox Steam update #1316046

\ ● Open Sound Architecture: the engine now supports full user-defined audio ingestion. Commanders can assign custom MP3, WAV, or OGG files for melee, ranged, and ambient tracks. ● Proximity-Dynamic Volume: melee and ranged sfx now react independently to screen-center proximity and camera zoom, so nearby combat naturally stands out over distant engagements. ● Acoustic Clarity Protocol: integrated a 120ms silence window with organic randomization to eliminate metallic echoes and ensure a natural combat rhythm. ● Quad-State Operation Toggle: new master control to cycle between 'Total Off', 'Simulation Only', 'Battle Only', and 'Dual Mode'. ● Cinematic Music Engine: persistent background tracks with manual calibration and full synchronization with the 'Reset' (Z) command. \ ● Melee Without Ammo Permission: troops can now be configured to maintain lethality in close combat even after complet...