TPG.PropTracking.CanSpawn

Would spawning this add-on push the player's team over any shared limit. Not currently called anywhere in this codebase -- the actual spawn-time enforcement lives in sv_duplication.lua, split across two places that do not agree on the comparison: * its post-paste check (in the AdvDupe_FinishPasting handler) uses >, strictly over, for points, weight and props alike; * its PlayerSpawnProp gate uses >=, at-or-over, on props only. This function uses >= throughout, so if it is ever wired back in it will refuse a team at exactly the cap on all three axes, which matches the prop gate but is one build stricter than the paste check.