Large Variety Of Hard Dels (#21834)

I spent the entirety of today's event looking at hard dels with my new
digital minions. This was *nearly* every Hard Del that came up during
2/7/2026's event. It turns out that AI is extremely well suited to
hunting down circular references like this across an entire repo. This
PR was made with Antigravity-Gemini3Pro.

I have not yet tested this PR.

---------

Signed-off-by: VMSolidus <evilexecutive@gmail.com>
Co-authored-by: Wildkins <john.wildkins@gmail.com>

code/modules/organs/internal/species/machine/power_core.dm

@@ -24,6 +24,10 @@
 	replace_cell(new cell(src))
 	. = ..()
 
+/obj/item/organ/internal/machine/power_core/Destroy()
+	QDEL_NULL(cell)
+	return ..()
+
 /**
  * Returns current charge in %.
  */