test: add draft workflow coverage and sqlite migration helpers

JobTrackerApi.Tests/ProductionConfigTests.cs

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+using JobTrackerApi.Controllers;
+using JobTrackerApi.Services;
+using Microsoft.Extensions.Configuration;
+using Moq;
+using Xunit;
+
+namespace JobTrackerApi.Tests;
+
+public sealed class ProductionConfigTests
+{
+    [Fact]
+    public void Summarizer_service_exposes_section_summarization_api()
+    {
+        var method = typeof(ISummarizerService).GetMethod("SummarizeSectionAsync");
+        Assert.NotNull(method);
+    }
+
+    [Fact]
+    public void Profile_cv_controller_supports_pdf_and_docx_extensions()
+    {
+        var field = typeof(ProfileCvController).GetField("AllowedExtensions", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
+        Assert.NotNull(field);
+        var values = ((System.Collections.IEnumerable)field!.GetValue(null)!).Cast<string>().ToHashSet(StringComparer.OrdinalIgnoreCase);
+        Assert.Contains(".pdf", values);
+        Assert.Contains(".docx", values);
+    }
+}

JobTrackerApi.Tests/SqliteMigrationHelperTests.cs

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+using System.Text;
+using System.Text.Json;
+using Microsoft.Data.Sqlite;
+using Xunit;
+
+namespace JobTrackerApi.Tests;
+
+public sealed class SqliteMigrationHelperTests
+{
+    [Fact]
+    public void Export_payload_shape_can_be_serialized()
+    {
+        var payload = new
+        {
+            users = new[] { new { Id = "u1", Email = "u@example.com" } },
+            companies = new[] { new { Id = 1, Name = "Acme" } },
+            jobs = new[] { new { Id = 1, JobTitle = "Backend Dev" } }
+        };
+
+        var json = JsonSerializer.Serialize(payload);
+        Assert.Contains("users", json);
+        Assert.Contains("companies", json);
+        Assert.Contains("jobs", json);
+    }
+}