Add get-story-summary and get-story-tasks tools

[sash]

Summary

This PR adds two new tools to the MCP server for more efficient story data retrieval:

• get-story-summary: Returns only the title and description of a story
• get-story-tasks: Returns all tasks (subtasks) for a story

Motivation

These tools provide more focused data retrieval options when you only need specific story information, avoiding the need to fetch the full story object when you just need the summary or tasks. Essential when trying to save model context.

Changes

• Added get-story-summary tool that returns id, name, description, and app_url
• Added get-story-tasks tool that returns all tasks with their details (id, description, complete, owner_ids, created_at, updated_at)
• Both tools reuse the existing getStory() API call for efficiency
• Updated tests to reflect the new tool count (from 15 to 17)

Testing

• All existing tests pass
• Updated StoryTools test to expect 17 tools instead of 15
• Both new methods follow the existing error handling patterns

Example Usage

// Get just the story summary
await tools.getStorySummary(12345);

// Get all tasks for a story
await tools.getStoryTasks(12345);

[charpeni]

Suggested change

	"Get all tasks (subtasks) for a Shortcut story",
	"Get all tasks for a Shortcut story",

We must be cautious here because sub-tasks aren't the same as tasks.