feat(content): cosmology frame — the Warden, the Sent, the Seven

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

content/world/canon/possession.json

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+{
+  "body": "How the Seven reach across into the world. Mostly it is not the horror the stories promise \u2014 it is influence, a hand on the scale of a mortal's wanting: the grudge nursed a little hotter, the easy cruelty made easier, the appetite that will not be talked down. That is the common work, and most of it is never noticed as anything but a person going bad. Outright possession \u2014 a king wearing a body like a coat \u2014 is rarer and costs the Seven dearly, and it is Nuun, the Hollow Choir, that does most of it; the others prefer a willing hand to a stolen one. A possessed mortal is not the enemy. The enemy is the thing inside them, and it will spend the body it wears without a thought.",
+  "id": "rule.possession",
+  "related": [
+    "faction.the-seven",
+    "rule.blood-price"
+  ],
+  "type": "rule"
+}