feat: add wave-based parallel task execution to Task Loop

src/lib/stores/prd.ts

@@ -6,6 +6,7 @@ export interface PrdTask {
   title: string;
   prompt: string;
   priority: "high" | "medium" | "low";
+  dependsOn?: string[];
 }
 
 export interface PrdFile {
@@ -31,7 +32,8 @@ Write the file to \`${workingDirectory}/hikari-tasks.json\` containing valid JSO
       "id": "task-1",
       "title": "<short descriptive title>",
       "prompt": "<detailed prompt that Claude Code can execute to complete this task>",
-      "priority": "<high|medium|low>"
+      "priority": "<high|medium|low>",
+      "dependsOn": []
     }
   ]
 }
@@ -43,6 +45,7 @@ Guidelines:
 - Prompts should be specific and actionable, not vague
 - Order tasks logically (dependencies first)
 - Assign priority: high for critical path, medium for features, low for polish/cleanup
+- Fill in \`dependsOn\` with IDs of tasks that must complete before this one (use \`[]\` if none)
 - Write only the JSON file — no explanations needed`;
 }