AtlasSpigot 26.2 - v3 (TNT/resource tuning)

Change from v2:

• dont-save-primed-tnt and dont-save-falling-block enabled - cuts disk I/O per chunk save when lots of TNT/falling blocks are active. Trade-off: those entities don't survive an unload+reload cycle.
• Confirmed already active in this Leaf build (no change needed, just verified): optimize-explosions, a Lithium-derived allocation reduction in the explosion damage calculator, and max-entity-collisions=8 capping collision cost when many entities cluster.
• Also: the F3/console brand fix from v2 was verified with an actual simulated client connection this time (not just a log line) - confirmed the server sends the correct 'AtlasSpigot' brand packet.

Same jar as v2 (no source changes this round) - see README for the full config list.