Count the two cases that were written but never counted

The visor and backtank cases went in with the space gems and were left off
`CASES`, so `GetItemSocketsEvent` found nothing to add and a space helmet
holding an Apothic case reported no socket. The life support pack carried the
same omission for the same reason - it is one list, and both ids were missing
from it.

Nothing was wrong with either module. They name the right `allowed_in_slots`
key, carry the right tags and wear the gemstone model, which is exactly what
made this hard to see: a case missing from the list still fits its slot and
still renders, and grants nothing. That is now said out loud in the `CASES`
javadoc and in the README, because the next socket that names a body part will
need a case of its own and will hide the same way if its id is forgotten.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -224,10 +224,19 @@ nothing asks for costs nothing.
 Nothing else changes. Sockets are counted per case rather than per item, so a
 sword with a case in its pommel reports one the same way a chestplate does and
 a guard holding two small cases reports two; Apotheosis sockets gems into
-weapons already. All three are filed under `packs/apotheosis` rather than with
+weapons already. They are all filed under `packs/apotheosis` rather than with
 the pommels, because a case without Apotheosis is an item that grants nothing,
 while a case without Arsenal is one that simply never fits anywhere.
 
+Every socket that names a body part needs a case of its own, because a slot
+takes only what its `allowed` list names and each of those lists names one key:
+the four limbs, the space helmet's visor and the backtank. That is the cost of
+placing a gem on the limb it was cut into - the generic case answers for
+`gem_armor_medium` and cannot answer for a key nothing else uses. The counting
+is by module id, so a new case has to be added to `CASES` in
+`ApothicSockets.java` as well as written; one that is missing from that list
+still fits its slot and still wears its gemstone, and grants nothing.
+
 One socket a case, and none of it is in the module JSON, because every route
 through data is closed. MIAPI's `components` property sets a component rather
 than adding to it, so two cases both writing `1` leave the piece with one socket

src/main/java/eu/abdelbaki/cmmodular/ApothicSockets.java

@@ -46,11 +46,14 @@ public final class ApothicSockets {
     private static final String MIAPI_MODULE = "smartin.miapi.modules.ItemModule";
 
     /**
-     * Module ids that are a gem case: one per gem size, one per limb socket.
-     * A case is not listed twice for being allowed in a pommel as well as in
-     * armour - it is one module either way, and this counts modules, so a
-     * guard holding two small cases is worth two sockets by the same rule
-     * that makes a chestplate holding one worth one.
+     * Module ids that are a gem case: one per gem size, and one per socket that
+     * names a body part - the four limbs, the space helmet's visor and the
+     * backtank. A case is not listed twice for being allowed in a pommel as
+     * well as in armour - it is one module either way, and this counts modules,
+     * so a guard holding two small cases is worth two sockets by the same rule
+     * that makes a chestplate holding one worth one. A case missing from this
+     * list still fits its slot and still wears its gemstone; it simply grants
+     * nothing, which is the failure that brought the space cases here.
      */
     private static final List<String> CASES = List.of(
             "cmmodular:gem/apothic_case",
@@ -59,7 +62,9 @@ public final class ApothicSockets {
             "cmmodular:gem/limb/case_arm_left",
             "cmmodular:gem/limb/case_arm_right",
             "cmmodular:gem/limb/case_leg_left",
-            "cmmodular:gem/limb/case_leg_right");
+            "cmmodular:gem/limb/case_leg_right",
+            "cmmodular:gem/space/case_helmet",
+            "cmmodular:gem/space/case_backtank");
 
     /** MIAPI's module tree, reached without naming its types at compile time. */
     private static Method getModules;