feat(HAI-001): handle optional title in engine components

packages/engine/src/executor.ts

@@ -72,7 +72,7 @@ export class TaskExecutor {
     if (this.executing.has(task.id)) return;
     this.executing.add(task.id);
 
-    console.log(`[executor] Starting ${task.id}: ${task.title}`);
+    console.log(`[executor] Starting ${task.id}: ${task.title || task.id}`);
 
     try {
       // Check dependencies
@@ -210,7 +210,7 @@ function buildExecutionPrompt(task: TaskDetail): string {
 
 ## Task Info
 - **ID:** ${task.id}
-- **Title:** ${task.title}
+- **Title:** ${task.title || task.id}
 ${task.dependencies.length > 0 ? `- **Dependencies:** ${task.dependencies.join(", ")}` : ""}
 
 ## PROMPT.md

packages/engine/src/scheduler.ts

@@ -89,7 +89,7 @@ export class Scheduler {
 
         // Dependencies met — move to in-progress
         console.log(
-          `[scheduler] Starting ${task.id}: ${task.title} (deps satisfied)`,
+          `[scheduler] Starting ${task.id}: ${task.title || task.id} (deps satisfied)`,
         );
         await this.store.moveTask(task.id, "in-progress");
         this.options.onSchedule?.(task);

packages/engine/src/triage.ts

@@ -96,7 +96,7 @@ export class TriageProcessor {
     if (this.processing.has(task.id)) return;
     this.processing.add(task.id);
 
-    console.log(`[triage] Specifying ${task.id}: ${task.title}`);
+    console.log(`[triage] Specifying ${task.id}: ${task.title || task.id}`);
     this.options.onSpecifyStart?.(task);
 
 
@@ -143,8 +143,8 @@ function buildSpecificationPrompt(task: TaskDetail, promptPath: string): string
 
 ## Task
 - **ID:** ${task.id}
-- **Title:** ${task.title}
-${task.description ? `- **Description:** ${task.description}` : ""}
+- **Title:** ${task.title || task.id}
+- **Description:** ${task.description}
 ${task.dependencies.length > 0 ? `- **Dependencies:** ${task.dependencies.join(", ")}` : ""}
 
 ## Current rough prompt