feat(refine): add RefineRunner, prompt/args helper, and interfaces

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

tests/ClaudeDo.Worker.Tests/Refine/RefinePromptTests.cs

@@ -0,0 +1,52 @@
+using ClaudeDo.Data.Models;
+using ClaudeDo.Worker.Refine;
+using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
+
+namespace ClaudeDo.Worker.Tests.Refine;
+
+public sealed class RefinePromptTests
+{
+    [Fact]
+    public void BuildArgs_includes_read_tools_when_repo_available()
+    {
+        var args = RefinePrompt.BuildArgs(20, canReadRepo: true);
+
+        Assert.Contains("--permission-mode acceptEdits", args);
+        Assert.Contains("mcp__claudedo__add_subtask", args);
+        Assert.Contains(" Read Grep Glob", args);
+    }
+
+    [Fact]
+    public void BuildArgs_drops_read_tools_in_text_only_mode()
+    {
+        var args = RefinePrompt.BuildArgs(20, canReadRepo: false);
+
+        Assert.DoesNotContain("Glob", args);
+        Assert.Contains("mcp__claudedo__update_task", args);
+    }
+
+    [Fact]
+    public void BuildPrompt_seeds_task_fields_and_open_subtasks()
+    {
+        var task = new TaskEntity
+        {
+            Id = "abc12345",
+            ListId = "l",
+            Title = "T",
+            Description = "D",
+            Status = TaskStatus.Idle,
+            CreatedAt = DateTime.UtcNow,
+        };
+        var subtasks = new List<SubtaskEntity>
+        {
+            new() { Id = "s1", TaskId = "abc12345", Title = "open one", Completed = false, CreatedAt = DateTime.UtcNow },
+            new() { Id = "s2", TaskId = "abc12345", Title = "done one", Completed = true, CreatedAt = DateTime.UtcNow },
+        };
+
+        var prompt = RefinePrompt.BuildPrompt(task, subtasks);
+
+        Assert.Contains("abc12345", prompt);
+        Assert.Contains("open one", prompt);
+        Assert.DoesNotContain("done one", prompt);
+    }
+}