Recurrent Complex Volts

Small stability update.

- Fixed a stack overflow crash caused by recursive worldgen decoration in certain modded biome generation setups.

- Added a guard to stop Recurrent Complex decoration from re-entering itself during nested decorate events.

- Prevented structure placement checks from triggering extra chunk loading/population when chunk-generation avoidance is enabled.

- Reduced the chance of cascading worldgen, lag spikes, and related generation instability in large modpacks.

Note: with avoidPlacerChunkGeneration enabled, some placements near chunk borders may now be skipped rather than forcing unsafe chunk probes.