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>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "mcp-familywall"
-version = "0.7.3"
+version = "0.7.4"
 description = "MCP server for Family Wall — read your family's lists and tasks via Claude"
 readme = "README.md"
 requires-python = ">=3.12"