fix(circles): protect primary circle from rename in update_circle (v0.7.5)

Adds isFirstFamily check to update_circle — mirrors the same guard
already present in delete_circle. Attempting to rename the primary
circle now returns a clear error instead of silently renaming it.

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 = "0.7.4"
+version = "0.7.5"
 description = "MCP server for Family Wall — read your family's lists and tasks via Claude"
 readme = "README.md"
 requires-python = ">=3.12"