Owner-validated sell RPC refunds SellRefundPercent of invested gold (Wall refunds 100% while un-upgraded), despawns the tower, and broadcasts a coin-burst VFX + rustle SFX. Refunds do not count as per-wave income. Investment/upgrade tracking added as the seam for the future upgrade system.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This may need to be changed later if we have any towers that have visuals that go underneath the ground. Right now that won't work, but we also don't have anything like that.