rename: The Armory -> The Reliquary; extend spec with essence + cross-over

Renaming: "Armory" read too militaristic for a séance app. Landed on "The
Reliquary" (not "The Threshold" — that name was already taken by the
landing-page back-link).

Spec addendum: added a visible essence currency (earned per summon, spent
on unlocks — distinct from the hidden favor score) and a fourth judgment
verdict, cross_over, for compassionately helping a genuinely benevolent
"stuck" spirit move on rather than just trusting or banishing it. Updates
workstreams B/C/E/F accordingly before any of them are dispatched.

frontend/src/i18n/en.json

@@ -28,7 +28,7 @@
     "heroKicker": "an instrument for speaking with the dead bandwidth",
     "cta": "BEGIN THE SÉANCE",
     "ctaCodex": "browse the codex",
-    "ctaShop": "visit the armory",
+    "ctaShop": "visit the reliquary",
     "stats": {
       "entities": "spirits catalogued",
       "sessions": "séances held",
@@ -57,10 +57,10 @@
     },
     "featured": "most disturbed spirits",
     "featuredEmpty": "the registry is still blank — be the first to disturb it",
-    "armory": {
-      "title": "HARDWARE FROM THE ARMORY",
+    "reliquary": {
+      "title": "HARDWARE FROM THE RELIQUARY",
       "line": "the Ultimate Quantum Box is coming — a handheld séance instrument that makes the veil knock louder.",
-      "link": "enter the armory →"
+      "link": "enter the reliquary →"
     },
     "footer": "an interactive horror art installation — the spirits are fiction; the static is real",
     "footerColophon": "self-hosted · no cloud · the veil runs on your machine"
@@ -267,7 +267,7 @@
   },
   "shop": {
     "back": "← the threshold",
-    "title": "THE ARMORY",
+    "title": "THE RELIQUARY",
     "subtitle": "instruments for those who would knock louder",
     "flagship": {
       "tag": "flagship instrument",