Lock the NPC identifier: full namespaced id (npc.mera-fenn) is canonical
everywhere — stored data, client dict key, and the /npc/speak wire. The API
load_npc changes from a filename lookup to an id-indexed load (matching the
client's ContentDB), reads persona from content/server, and resolves the
client's reveal-set fact_ids to topic bodies. Legacy Fenn keeps working; no
migration required. First task of the runtime-consumption cycle.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HuHRPE7VfppUJEaoGBEUqZ
