Refactor config loading and add status code docs

- Move config loading to dedicated ConfigLoader class with validation
- Add DATABASE_MIGRATIONS.md content to TROUBLESHOOTING.md
- Add API_STATUS_CODES.md documenting all API response codes
- Update runner.csx to use new config structure
- Add check_responses.py validation script
- Update config tests for new structure

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Docs/runner.csx

@@ -113,10 +113,28 @@ for (int i = 0; i < items.Count; i++)
     );
     if (cts.IsCancellationRequested) break;
 
-    // Step 3 — check for "yes" in the reply
-    if (!confirmation.Contains("yes", StringComparison.OrdinalIgnoreCase))
+    // Step 3 — check for "yes" in the reply, with retry logic for issue resolution
+    int maxRetries = 3;
+    int retryCount = 0;
+    bool taskConfirmed = confirmation.Contains("yes", StringComparison.OrdinalIgnoreCase);
+
+    while (!taskConfirmed && retryCount < maxRetries)
     {
-        Console.WriteLine("\n[runner] Task not confirmed as done. Stopping.");
+        retryCount++;
+        Console.WriteLine($"\n[runner] Attempt {retryCount}/{maxRetries}: Resolving remaining issues and running tests...\n");
+        
+        confirmation = await RunCopilot(
+            new[] { "--continue" },
+            "resolve any remaining issues, make sure all tests are running and pass. then confirm with yes if done"
+        );
+        if (cts.IsCancellationRequested) break;
+        
+        taskConfirmed = confirmation.Contains("yes", StringComparison.OrdinalIgnoreCase);
+    }
+
+    if (!taskConfirmed)
+    {
+        Console.WriteLine($"\n[runner] Task not confirmed as done after {maxRetries} attempts. Stopping.");
         break;
     }