Implement Phase 4 improvements from IMPROVEMENTS.md

IMPROVEMENTS.md

@@ -679,6 +679,13 @@ public class AuditLogger
 4. ✅ Task caching (based on input file hashes with `--no-cache` bypass)
 5. ✅ Plugin system (ITaskTypeProvider interface and PluginLoader)
 
+### Phase 4 (Developer Experience & Code Quality) ✅ COMPLETED
+1. ✅ Task Aliases - Create shortcuts for common task combinations (`aliases` in config)
+2. ✅ Shell Completions - Generate shell completions (`rot completion bash|zsh|fish|powershell`)
+3. ✅ Config File Auto-Discovery - Search up directory tree for tasks file
+4. ✅ Task Graph Visualization - Show task dependency graph (`rot graph [task]`)
+5. ✅ Result Pattern for Error Handling - `TaskResult` and `TasksResult` types with `ExecuteTaskWithResultAsync`
+
 ---
 
 ## Related Resources

Rot.Tests/Phase3Tests.cs

@@ -318,7 +318,7 @@ public async Task ExecuteTaskAsync_WithProfileEnv_AppliesEnvironment()
         {
             ["PROFILE_VAR"] = "profile-value"
         };
-        var executor = new TaskExecutor(tasks, profileEnv: profileEnv);
+        var executor = new TaskExecutor(tasks, aliases: null, profileEnv: profileEnv);
 
         var result = await executor.ExecuteTaskAsync("check-env");
 
@@ -344,7 +344,7 @@ public async Task ExecuteTaskAsync_TaskEnvOverridesProfileEnv()
         {
             ["OVERRIDE_VAR"] = "profile-value"
         };
-        var executor = new TaskExecutor(tasks, profileEnv: profileEnv);
+        var executor = new TaskExecutor(tasks, aliases: null, profileEnv: profileEnv);
 
         var result = await executor.ExecuteTaskAsync("check-env");
 
@@ -530,15 +530,15 @@ public async Task ExecuteTaskAsync_NoCacheFlag_BypassesCache()
             };
 
             // First run with cache
-            var executor1 = new TaskExecutor(tasks, noCache: false);
+            var executor1 = new TaskExecutor(tasks, aliases: null, noCache: false);
             await executor1.ExecuteTaskAsync("cached-task");
 
             // Delete output file
             if (File.Exists(outputFile))
                 File.Delete(outputFile);
 
             // Second run with noCache - should execute
-            var executor2 = new TaskExecutor(tasks, noCache: true);
+            var executor2 = new TaskExecutor(tasks, aliases: null, noCache: true);
             await executor2.ExecuteTaskAsync("cached-task");
 
             Assert.True(File.Exists(outputFile));