feat(content): the Seven — seven demon kings and their blood

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HuHRPE7VfppUJEaoGBEUqZ

content/world/canon/nuun-the-hollow-choir.json

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+{
+  "body": "Nuun, the Hollow Choir, the many-voiced. The blood Nuun gathers is a mortal's own \u2014 the self-slain, the ones talked into the river or off the roof by a voice they took for their own thought. Its army is the emptied, and it is Nuun, of all the Seven, that most often does the old horror outright and wears a mortal like a coat, because a hollowed body is the only kind it truly wants. It works through the whisper, the crack in a mind widened patiently until there is room for something else to move in. A person going quietly, terribly wrong, and swearing nothing is the matter, is Nuun's ordinary work.",
+  "id": "person.nuun-the-hollow-choir",
+  "related": [
+    "faction.the-seven",
+    "rule.possession"
+  ],
+  "type": "person"
+}