feat: add get_members tool, refactor get_circles via _famlistfamily helper (v0.4.7)

famlistfamily response already contains members[] on each circle object.
get_members(circle_id=None) extracts id, name, email, role, right, color,
avatar, circle_id and circle_name. get_circles refactored to use the new
_famlistfamily() helper, eliminating duplicated auth/call/logout logic.
SPEC.md updated with full famlistfamily response structure.

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

README.md

@@ -2,11 +2,12 @@
 
 MCP server for [Family Wall](https://www.familywall.com) -- read and manage your family's circles, lists, and tasks directly from Claude.
 
-## Features (v0.4.6)
+## Features (v0.4.7)
 
 ### 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
 - `get_activities` -- list recent wall activities