feat(content): promote Duncarrow; build client/server artifacts

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

content/world/canon/elves.json

@@ -0,0 +1,6 @@
+{
+  "body": "The elven travellers of the road \u2014 no single polity, but the people whose passage through the White Antlers, and its recent absence, the town notices.",
+  "id": "faction.elves",
+  "related": [],
+  "type": "faction"
+}