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

Made-with: Cursor

world/spells/thorns.toml

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+name = "Thorns"
+description = "Vicious thorns grow from your body, damaging anyone who attacks you."
+spell_type = "offensive"
+damage = 5
+damage_type = "physical"
+cost_mana = 10
+cooldown_ticks = 5
+effect = "thorns"
+effect_duration = 10
+effect_magnitude = 5
+min_guild_level = 10