New modules:

• Projectile Limiter — per-player and per-world caps on active projectiles (arrows, snowballs, fireballs, tridents) with cached counts to avoid live entity scans; stuck arrow cleanup; lag-aware cap reduction
• Chat Throttler — sliding-window rate limiter for chat messages and commands; auto-mute and optional kick on flood; command whitelist for auth plugins
• Portal Limiter — per-player cooldown between portal uses (Nether, End, gateway) to prevent rapid dimension switching from spiking chunk load MSPT; lag-aware cooldown multiplier