fix(confidence-engine): expose failed provider path

lib/llm/provider.js

@@ -119,7 +119,8 @@ class OllamaLlmProvider {
       try {
         const controller = new AbortController();
         const timeout = setTimeout(() => controller.abort(), 60000);
-        
+
+        apiUsed = "/api/chat";
         const res = await fetch(`${baseUrl}/api/chat`, {
           method: "POST",
           headers: { "Content-Type": "application/json" },
@@ -180,14 +181,14 @@ class OllamaLlmProvider {
         }
 
         fullResponseData = await res.json();
-        
+
         rawResponse = typeof fullResponseData.response === "string"
           ? fullResponseData.response
           : JSON.stringify(fullResponseData);
 
       } catch (e) {
         if (apiUsed === "/api/generate") {
-          throw new Error(
+          const error = new Error(
             `Ollama /api/generate request timed out after 5 minutes.\n\n` +
             `This usually means:\n` +
             `1. The model is loading into memory for the first time (cold start) — this can take several minutes\n` +
@@ -198,6 +199,8 @@ class OllamaLlmProvider {
             `- Use a smaller model (e.g., llama3.1 instead of llama3.1:70b)\n` +
             `- Check Ollama logs: \`ollama serve\` or look at your system logs`
           );
+          error.providerApiPath = apiUsed;
+          throw error;
         }
         throw e;
       }
@@ -225,7 +228,7 @@ class OllamaLlmProvider {
         }
       }
 
-      throw new Error(
+      const error = new Error(
         "Model produced empty output.\n\n" +
         "API used: " + (apiUsed || "none") + "\n" +
         "/api/chat supported: " + chatSupported + "\n" +
@@ -236,6 +239,8 @@ class OllamaLlmProvider {
         "- This Ollama version does not support format:json — using prompt instructions only (reliability varies)\n" +
         "- If your model is very small (e.g., tinyllama, phi), try a larger one like llama3.1 or mistral"
       );
+      error.providerApiPath = apiUsed;
+      throw error;
     }
 
     // ================================================================
@@ -245,7 +250,7 @@ class OllamaLlmProvider {
       return recoverJson(rawResponse);
     } catch (e) {
       if (e instanceof SyntaxError) {
-        throw new Error(
+        const error = new Error(
           "Model returned output that could not be parsed as valid JSON.\n\n" +
           "API used: " + (apiUsed || "none") + "\n" +
           "/api/chat supported: " + chatSupported + "\n" +
@@ -256,6 +261,8 @@ class OllamaLlmProvider {
           "- Shorten your scenario to under 500 words\n" +
           "- Consider upgrading Ollama: https://ollama.com/download"
         );
+        error.providerApiPath = apiUsed;
+        throw error;
       }
       throw e;
     }