Make provider errors more specific

app/models/provider.rb

@@ -61,13 +61,12 @@ class Provider
     # Override to set class-level error transformation for methods using `with_provider_response`
     def default_error_transformer(error)
       if error.is_a?(Faraday::Error)
-        Error.new(
+        self.class::Error.new(
           error.message,
           details: error.response&.dig(:body),
-          provider: self.class.name
         )
       else
-        Error.new(error.message, provider: self.class.name)
+        self.class::Error.new(error.message)
       end
     end
 

app/models/provider/openai.rb

@@ -1,6 +1,9 @@
 class Provider::Openai < Provider
   include LlmProvider
 
+  # Subclass so errors caught in this provider are raised as Provider::Openai::Error
+  Error = Class.new(Provider::Error)
+
   MODELS = %w[gpt-4o]
 
   def initialize(access_token)

app/models/provider/synth.rb

@@ -1,6 +1,9 @@
 class Provider::Synth < Provider
   include ExchangeRateProvider, SecurityProvider
 
+  # Subclass so errors caught in this provider are raised as Provider::Synth::Error
+  Error = Class.new(Provider::Error)
+
   def initialize(api_key)
     @api_key = api_key
   end