feat(show): add comma-separated ID support for multi-task viewing

- Enhanced get-task/show command to support comma-separated task IDs for efficient batch operations.
- New features include multiple task retrieval, smart display logic, interactive action menu with batch operations, MCP array response for AI agent efficiency, and support for mixed parent tasks and subtasks.
- Implementation includes updated CLI show command, enhanced MCP get_task tool, modified showTaskDirect function, and maintained full backward compatibility.
- Documentation updated across all relevant files.

Benefits include faster context gathering for AI agents, improved workflow with interactive batch operations, better UX with responsive layout, and enhanced API efficiency.

README.md

@@ -130,6 +130,7 @@ Use your AI assistant to:
 - Parse requirements: `Can you parse my PRD at scripts/prd.txt?`
 - Plan next step: `What’s the next task I should work on?`
 - Implement a task: `Can you help me implement task 3?`
+- View multiple tasks: `Can you show me tasks 1, 3, and 5?`
 - Expand a task: `Can you help me expand task 4?`
 
 [More examples on how to use Task Master in chat](docs/examples.md)
@@ -173,6 +174,9 @@ task-master list
 # Show the next task to work on
 task-master next
 
+# Show specific task(s) - supports comma-separated IDs
+task-master show 1,3,5
+
 # Generate task files
 task-master generate
 ```