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>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "mcp-familywall"
-version = "0.4.6"
+version = "0.4.7"
 description = "MCP server for Family Wall — read your family's lists and tasks via Claude"
 readme = "README.md"
 requires-python = ">=3.12"