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/the-seven.json

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+{
+  "body": "Seven kings and the armies that answer to them \u2014 the Warden's enemy, and the world's. They do not want to rule the races so much as end them, dead or yoked, it makes little difference to the Seven which. Each king is its own hunger and keeps its own kind of war, and they cooperate the way wolves cooperate, which is to say until the meat runs low. What they run on is blood: spilled, sacrificed, offered. A mortal who learns how to feed them can be given a share of what that blood buys. Most of the Margreave believes the Seven are real. Most of the Margreave is right.",
+  "id": "faction.the-seven",
+  "related": [
+    "person.the-warden",
+    "rule.blood-price",
+    "rule.possession"
+  ],
+  "type": "faction"
+}