fix: ResetData provider - reasoning chains, URL paths, error parsing, model list

- Add Reasoning/ReasoningContent fields to ResetDataMessage struct
- Wire reasoning extraction to TaskResponse.Reasoning in ExecuteTask
- Fix double /v1 in makeRequest and testConnection URL construction
- Handle both ResetData error formats (flat string and nested object)
- Update supported models to actual ResetData beta inventory

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pkg/ai/resetdata.go

@@ -30,8 +30,10 @@ type ResetDataRequest struct {
 
 // ResetDataMessage represents a message in the ResetData format
 type ResetDataMessage struct {
-	Role    string `json:"role"`    // system, user, assistant
+	Role             string `json:"role"`                        // system, user, assistant
-	Content string `json:"content"`
+	Content          string `json:"content"`
+	Reasoning        string `json:"reasoning,omitempty"`         // reasoning chain (GLM-4.7, GPT-OSS, Nemotron 3 Nano)
+	ReasoningContent string `json:"reasoning_content,omitempty"` // alternate reasoning field (GPT-OSS)
 }
 
 // ResetDataResponse represents a response from ResetData LaaS API
@@ -107,7 +109,7 @@ func (p *ResetDataProvider) ExecuteTask(ctx context.Context, request *TaskReques
 	}
 
 	// Execute the request
-	response, err := p.makeRequest(ctx, "/v1/chat/completions", resetDataReq)
+	response, err := p.makeRequest(ctx, "/chat/completions", resetDataReq)
 	if err != nil {
 		return nil, err
 	}
@@ -122,6 +124,12 @@ func (p *ResetDataProvider) ExecuteTask(ctx context.Context, request *TaskReques
 	choice := response.Choices[0]
 	responseText := choice.Message.Content
 
+	// Extract reasoning chain - prefer Reasoning field, fall back to ReasoningContent
+	reasoning := choice.Message.Reasoning
+	if reasoning == "" {
+		reasoning = choice.Message.ReasoningContent
+	}
+
 	// Parse response for actions and artifacts
 	actions, artifacts := p.parseResponseForActions(responseText, request)
 
@@ -132,6 +140,7 @@ func (p *ResetDataProvider) ExecuteTask(ctx context.Context, request *TaskReques
 		ModelUsed: response.Model,
 		Provider:  "resetdata",
 		Response:  responseText,
+		Reasoning: reasoning,
 		Actions:   actions,
 		Artifacts: artifacts,
 		StartTime: startTime,
@@ -405,7 +414,7 @@ func (p *ResetDataProvider) makeRequest(ctx context.Context, endpoint string, re
 
 // testConnection tests the connection to ResetData API
 func (p *ResetDataProvider) testConnection(ctx context.Context) error {
-	url := strings.TrimSuffix(p.config.Endpoint, "/") + "/v1/models"
+	url := strings.TrimSuffix(p.config.Endpoint, "/") + "/models"
 	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
 	if err != nil {
 		return err
@@ -429,52 +438,92 @@ func (p *ResetDataProvider) testConnection(ctx context.Context) error {
 
 // getSupportedModels returns a list of supported ResetData models
 func (p *ResetDataProvider) getSupportedModels() []string {
-	// Common models available through ResetData LaaS
+	// Models available through ResetData beta (as of 2026-02)
 	return []string{
-		"llama3.1:8b", "llama3.1:70b",
+		"zai-org/glm-4.7-fp8",
-		"mistral:7b", "mixtral:8x7b",
+		"openai/gpt-oss-120b",
-		"qwen2:7b", "qwen2:72b",
+		"google/gemma-3-27b-it",
-		"gemma:7b", "gemma2:9b",
+		"meta/llama-3.1-8b-instruct",
-		"codellama:7b", "codellama:13b",
+		"nvidia/nemotron-3-nano-30b-a3b",
+		"nvidia/cosmos-reason2-8b",
+		"nvidia/nemotron-nano-2-vl",
 	}
 }
 
 // handleHTTPError converts HTTP errors to provider errors
 func (p *ResetDataProvider) handleHTTPError(statusCode int, body []byte) *ProviderError {
-	bodyStr := string(body)
+	// Extract a human-readable error message from the response body.
+	// ResetData returns two formats:
+	//   Format 1 (auth): {"success":false,"error":"Invalid or expired token"}
+	//   Format 2 (model/validation): {"error":{"message":"...","type":"...","code":"..."}}
+	errMsg := p.extractErrorMessage(body)
 
 	switch statusCode {
 	case http.StatusUnauthorized:
 		return &ProviderError{
 			Code:      "UNAUTHORIZED",
-			Message:   "Invalid ResetData API key",
+			Message:   fmt.Sprintf("ResetData auth failed: %s", errMsg),
-			Details:   bodyStr,
+			Details:   string(body),
 			Retryable: false,
 		}
 	case http.StatusTooManyRequests:
 		return &ProviderError{
 			Code:      "RATE_LIMIT_EXCEEDED",
-			Message:   "ResetData API rate limit exceeded",
+			Message:   fmt.Sprintf("ResetData rate limit: %s", errMsg),
-			Details:   bodyStr,
+			Details:   string(body),
 			Retryable: true,
 		}
 	case http.StatusInternalServerError, http.StatusBadGateway, http.StatusServiceUnavailable:
 		return &ProviderError{
 			Code:      "SERVICE_UNAVAILABLE",
-			Message:   "ResetData API service unavailable",
+			Message:   fmt.Sprintf("ResetData unavailable: %s", errMsg),
-			Details:   bodyStr,
+			Details:   string(body),
 			Retryable: true,
 		}
 	default:
 		return &ProviderError{
 			Code:      "API_ERROR",
-			Message:   fmt.Sprintf("ResetData API error (status %d)", statusCode),
+			Message:   fmt.Sprintf("ResetData error (status %d): %s", statusCode, errMsg),
-			Details:   bodyStr,
+			Details:   string(body),
 			Retryable: true,
 		}
 	}
 }
 
+// extractErrorMessage parses error details from ResetData API response bodies.
+func (p *ResetDataProvider) extractErrorMessage(body []byte) string {
+	// Try Format 2: {"error":{"message":"...","type":"...","code":"..."}}
+	var nestedErr struct {
+		Error struct {
+			Message string `json:"message"`
+			Type    string `json:"type"`
+			Code    string `json:"code"`
+		} `json:"error"`
+	}
+	if err := json.Unmarshal(body, &nestedErr); err == nil && nestedErr.Error.Message != "" {
+		if nestedErr.Error.Type != "" {
+			return fmt.Sprintf("%s (%s)", nestedErr.Error.Message, nestedErr.Error.Type)
+		}
+		return nestedErr.Error.Message
+	}
+
+	// Try Format 1: {"success":false,"error":"string message"}
+	var flatErr struct {
+		Success bool   `json:"success"`
+		Error   string `json:"error"`
+	}
+	if err := json.Unmarshal(body, &flatErr); err == nil && flatErr.Error != "" {
+		return flatErr.Error
+	}
+
+	// Fallback: return raw body truncated
+	s := string(body)
+	if len(s) > 200 {
+		s = s[:200] + "..."
+	}
+	return s
+}
+
 // parseResponseForActions extracts actions from the response text
 func (p *ResetDataProvider) parseResponseForActions(response string, request *TaskRequest) ([]TaskAction, []Artifact) {
 	var actions []TaskAction