Nametagged Hostile No Despawn

• Hostile mobs that have been nametagged (or otherwise given a custom name and made persistent) no longer despawn when the game is set to Peaceful; unnamed hostiles still clear out as usual.
• Uses a mixin on hostile mobs' peaceful-removal check to allow named, persistent mobs to stay loaded without affecting other despawn rules.
• Runs on both client and server; no configuration is required beyond installing the mod.
• Known limitation: only affects mobs counted as hostile; neutral/passive creatures already ignore the Peaceful cleanup and are unchanged. Future improvements could add a config toggle to extend or narrow which mobs stay.

Server Validation

✅ Server validation passed - The mod was tested on a real Minecraft server and loaded successfully.