feat: due_date, assignee_ids, list_id for create_task/update_task (v0.4.14)

- create_task: new optional params due_date (ISO 8601) and assignee_ids (list[str])
- update_task: new optional params due_date, assignee_ids, and list_id (move task)
- get_tasks: returns due_date and assignee_ids fields per task
- API params verified via FW_DEBUG=1: dueDate, assignee, taskListId
- SPEC.md, README, CLAUDE.md updated

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -2,21 +2,21 @@
 
 MCP server for [Family Wall](https://www.familywall.com) -- read and manage your family's circles, lists, and tasks directly from Claude.
 
-## Features (v0.4.13)
+## Features (v0.4.14)
 
 ### Read
 
 - `get_circles` -- list all family circles
 - `get_members` -- list members of a circle (or all circles)
 - `get_lists` -- list all task lists (optionally filtered by circle)
-- `get_tasks` -- list tasks in a specific list (includes `category_id` field)
+- `get_tasks` -- list tasks in a specific list (includes `category_id`, `due_date`, `assignee_ids`)
 - `get_categories` -- list categories for a list (locale-filtered; custom categories always included; `custom` flag marks user-created ones)
 - `get_activities` -- list recent wall activities (author resolved to display name)
 
 ### Write (with confirmation prompt)
 
-- `create_task` -- create a new task in a list (supports `category_id` for shopping lists)
-- `update_task` -- update text, description, and/or category of an existing task
+- `create_task` -- create a new task in a list (supports `category_id`, `due_date`, `assignee_ids`)
+- `update_task` -- update text, description, category, due date, assignees, or move to a different list
 - `toggle_task` -- mark a task complete or reopen it
 - `delete_task` -- permanently delete a task
 - `create_category` -- create a custom category for a shopping list (with optional icon)