revert(perf): remove Flerovium and the spawn tuning

Run 3 benches (analysis/client-perf/RESULTS-proxy.md): Flerovium's run-2
win did not reproduce (S1 slightly worse, S3 within noise), and the
moderate spawn tuning (d80f85b, 8e8483d) left total mob counts unchanged
across 4 runs per config. Owner approved removing both. The mods now
regenerate their default spawn configs.

.packwizignore

@@ -65,11 +65,7 @@ config/paxi/datapacks/*
 # Default Options copies them into place client-side, only when the target is absent.
 !config/defaultoptions
 !config/defaultoptions/**
-# Server spawn tuning (analysis/client-perf/SPAWN-TUNING.md); partial files, the mods
-# fill in defaults for every other key. Enforced: the server reads them from here.
-!config/alexsmobs-common.toml
-!config/fowlplay.json5
-!config/crittersandcompanions-common.json5
+# Spawn tuning reverted 2026-10-18: bench B14 showed no measurable load reduction.
 # ModernFix mixin overrides (build.py SHIP; enforced - ModernFix reads it before
 # Default Options runs). dynamic_resources=true per bench B6.
 !config/modernfix-mixins.properties