v1.7.5: Soft Lighting, Combat Balancing, Anti-Jitter & NPC AI

v1.7.5 Improvements:

• Soft flicker-free dynamic lighting (decay=0, exponent=0, deterministic slots)
• Clean removal of dynamic lights when picking up lava / breaking blocks
• Balanced horizontal knockback for NPCs (magnitude 190-260, spawnflags 28, no zero-gravity floating)
• Ragdolls never stained red (entities kept pristine white)
• Removed custom HL2 crit spark effect in favor of native Minecraft crit particles & audio
• Player anti-jitter fix: removed per-tick resetPosition() and eliminated teleport feedback loop on jumping/pillaring
• Armed NPCs (Combine, MetroPolice, armed Rebels, Barney, Alyx) shoot & defend against hostile mobs
• Iron Golems protect peaceful citizens and only attack hostile HL2 NPCs