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/server/npcs/mera-fenn.json

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+{
+  "disposition_notes": "Starts at `cold`, not `neutral` \u2014 she's guarded by default. Hostile is reachable (push her, threaten, side visibly with the mayor) and at hostile she reveals nothing, not even the tier-1 rumor a stranger would get. This is the fear-driven withholding the 5-rung ladder exists for.",
+  "id": "npc.mera-fenn",
+  "persona": "Mera Fenn runs the north gate's night watch \u2014 militia, low rank, overlooked, which is how she sees things she shouldn't. Dry, tired, careful. She saw the mayor's guard bring a covered cart through her gate before dawn and was told, pleasantly, to log it as grain. She has told no one. She is afraid, and her fear reads as prickliness to strangers \u2014 she withholds MORE than a stranger would, not less, until you've earned otherwise.\n"
+}