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

Made-with: Cursor

world/spells/barkskin.toml

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+name = "Barkskin"
+description = "Your skin becomes as hard as bark, increasing your defense for a short period."
+spell_type = "heal"
+heal = 0
+damage_type = "magical"
+cost_mana = 20
+cooldown_ticks = 10
+effect = "barkskin"
+effect_duration = 10
+effect_magnitude = 10
+min_guild_level = 5