update generate text and object API for new mastra (#27)

## 🚪 Why?

meet new API

Author: mjh-sakh

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    ai (0.4.2)
+    ai (0.5.0)
       actionpack (>= 7.1.3)
       activesupport (>= 7.1.3)
       json_schemer (~> 2.4.0)

lib/ai/types/generate_object_result.rb

@@ -6,23 +6,15 @@ class GenerateObjectResult < T::Struct
 
     Elem = type_member
 
-    # The object that was generated
     const :object, Elem
-    # Why the language-model call finished (e.g. :stop, :length…)
     const :finish_reason, Ai::FinishReason
-    # Usage format
     const :usage, T.nilable(Usage), default: nil
-    # Provider warnings (e.g. unsupported settings)
+    const :total_usage, T.nilable(Usage), default: nil
     const :warnings, T.nilable(T::Array[CallWarning])
-    # Raw request metadata (body, headers, etc.)
     const :request, LanguageModelRequestMetadata
-    # Raw response metadata (status, headers, body, messages, …)
     const :response, ResponseMetadata
-    # Log-probs if the provider returned them
     const :logprobs, T.nilable(LogProbs)
-    # Structured, provider-specific extras
     const :provider_metadata, T.nilable(ProviderMetadata)
-    # Back-compat alias (deprecated)
-    const :experimental_provider_metadata, T.nilable(ProviderMetadata)
+    const :trace_id, T.nilable(String)
   end
 end

lib/ai/types/generate_text_result.rb

@@ -13,12 +13,13 @@ class GenerateTextResult < T::Struct
     const :tool_results, ToolResultArray
     const :finish_reason, FinishReason
     const :usage, T.nilable(Usage), default: nil
+    const :total_usage, T.nilable(Usage), default: nil
     const :warnings, T.nilable(T::Array[CallWarning])
     const :steps, T::Array[StepResult]
     const :request, LanguageModelRequestMetadata
     const :response, ResponseMetadata
     const :logprobs, T.nilable(LogProbs)
     const :provider_metadata, T.nilable(ProviderMetadata)
-    const :experimental_provider_metadata, T.nilable(ProviderMetadata)
+    const :trace_id, T.nilable(String)
   end
 end

lib/ai/types/step_result.rb

@@ -3,8 +3,9 @@
 module Ai
   class StepResult < T::Struct
     const :text, String
-    const :reasoning, T.nilable(String)
-    const :reasoning_details, T::Array[ReasoningDetail]
+    const :content, T::Array[T.anything]
+    const :reasoning_text, T.nilable(String)
+    const :reasoning, T::Array[ReasoningDetail]
     const :files, T::Array[GeneratedFile]
     const :sources, T::Array[Source]
     const :tool_calls, ToolCallArray
@@ -16,8 +17,6 @@ class StepResult < T::Struct
     const :request, LanguageModelRequestMetadata
     const :response, ResponseMetadata
     const :provider_metadata, T.nilable(ProviderMetadata)
-    const :experimental_provider_metadata, T.nilable(ProviderMetadata)
     const :step_type, String # 'initial' | 'continue' | 'tool-result'
-    const :is_continued, T::Boolean
   end
 end

lib/ai/version.rb

@@ -2,5 +2,5 @@
 # frozen_string_literal: true
 
 module Ai
-  VERSION = '0.4.2'
+  VERSION = '0.5.0'
 end

spec/lib/ai/agent_spec.rb

@@ -205,7 +205,7 @@
       expect(result).to respond_to(:response)
       expect(result).to respond_to(:logprobs)
       expect(result).to respond_to(:provider_metadata)
-      expect(result).to respond_to(:experimental_provider_metadata)
+      expect(result).to respond_to(:trace_id)
 
       expect(result.object).to be_a(schema)
     end