Add world content: warden class, druids guild, sylvan race, town expansion, whispering_woods region

Made-with: Cursor

world/town/npcs/thief_boss.toml

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+name = "Silas the Shadow"
+description = "A lean, scarred man twirling a dagger. He moves with deadly, practiced grace."
+room = "town:thieves_hideout"
+base_attitude = "hostile"
+class = "class:rogue"
+
+[stats]
+hp = 150
+attack = 20
+defense = 15
+xp = 400
+
+[dialogue]
+greeting = "You shouldn't have come down here, friend."