refactor: rename sisyphus_task to delegate_task

- Rename directories: sisyphus-task → delegate-task
- Rename types: SisyphusTaskArgs → DelegateTaskArgs, etc.
- Rename functions: createSisyphusTask → createDelegateTask
- Rename constants: SISYPHUS_TASK_* → DELEGATE_TASK_*
- Update tool name: sisyphus_task → delegate_task
- Update all prompts, docs, and tests

src/hooks/agent-usage-reminder/constants.ts

@@ -24,7 +24,7 @@ export const TARGET_TOOLS = new Set([
 export const AGENT_TOOLS = new Set([
   "task",
   "call_omo_agent",
-  "sisyphus_task",
+  "delegate_task",
 ]);
 
 export const REMINDER_MESSAGE = `
@@ -32,13 +32,13 @@ export const REMINDER_MESSAGE = `
 
 You called a search/fetch tool directly without leveraging specialized agents.
 
-RECOMMENDED: Use sisyphus_task with explore/librarian agents for better results:
+RECOMMENDED: Use delegate_task with explore/librarian agents for better results:
 
 \`\`\`
 // Parallel exploration - fire multiple agents simultaneously
-sisyphus_task(agent="explore", prompt="Find all files matching pattern X")
-sisyphus_task(agent="explore", prompt="Search for implementation of Y") 
-sisyphus_task(agent="librarian", prompt="Lookup documentation for Z")
+delegate_task(agent="explore", prompt="Find all files matching pattern X")
+delegate_task(agent="explore", prompt="Search for implementation of Y") 
+delegate_task(agent="librarian", prompt="Lookup documentation for Z")
 
 // Then continue your work while they run in background
 // System will notify you when each completes
@@ -50,5 +50,5 @@ WHY:
 - Specialized agents have domain expertise
 - Reduces context window usage in main session
 
-ALWAYS prefer: Multiple parallel sisyphus_task calls > Direct tool calls
+ALWAYS prefer: Multiple parallel delegate_task calls > Direct tool calls
 `;