feat(circles): add update_circle tool (v0.7.4)

Implements accupdatefamily endpoint (verified via FW_DEBUG=1):
- Parameter 'scope' targets any circle (primary or secondary)
- Without scope: renames the primary circle (API default)
- Server always capitalises the first letter of the new name
- Verifies circle existence via famlistfamily in same session
- Response a00.r.r = full circle object with updated name

Also corrects SPEC.md: accupdatefamily with scope= works for any
circle, not just the primary (previous note was incomplete).

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

README.md

@@ -2,7 +2,7 @@
 
 MCP server for [Family Wall](https://www.familywall.com) -- read and manage your family's circles, lists, tasks, and recipes directly from Claude.
 
-## Features (v0.7.3)
+## Features (v0.7.4)
 
 ### Read
 
@@ -31,6 +31,7 @@ MCP server for [Family Wall](https://www.familywall.com) -- read and manage your
 - `update_recipe` -- update any field of an existing recipe (partial update — omitted fields unchanged)
 - `delete_recipe` -- permanently delete a recipe (only own recipes)
 - `create_circle` -- create a new Family Wall circle (group)
+- `update_circle` -- rename a circle (server capitalises first letter; only name is changeable via API)
 - `delete_circle` -- permanently delete a circle and all its content (primary circle is protected)
 - `add_member_to_circle` -- invite a person to a circle by e-mail (for new Family Wall users only; existing accounts require in-app invitation)