Create librarian mob template as a non-combatant NPC with:
- dialogue tree linking (npc_name field)
- time-based schedule (working 7-21, idle otherwise)
- empty moves list (cannot fight)
Wire dialogue tree loading into server startup to load from content/dialogue/.
Add npc_name field to MobTemplate and spawn_mob to preserve dialogue tree links.
Integration tests verify:
- spawning from template preserves npc_name and schedule
- full conversation flow (start, advance, end)
- converse state blocks movement
- schedule transitions change behavior state
- working state blocks movement
- patrol behavior follows waypoints
