Expose Homebox set_item edit tool to admin agent

Allowlist homebox-mcp's general item editor so the agent can rename items
and edit description, notes, quantity, purchase info, flags and custom
fields. Only passed args change; the rest of the item is preserved.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

utils/homebox_mcp.py

@@ -25,6 +25,7 @@ HOMEBOX_TOOL_ALLOWLIST = (
     "inventory_stats",
     "list_maintenance",
     "create_item",
+    "set_item",
     "move_item",
     "log_maintenance",
 )