Fix add_sensor_attachments mixing link elements into joints list

[Copilot]

add_sensor_attachments was appending <link> elements into the joints list, which would cause link elements to be emitted in the joint section of the assembled URDF.

Changes

• connection.py — add_sensor_attachments: Added a links: list parameter; sensor <link> elements now append to links, while <joint> elements (from the sensor URDF and the new attachment joint) continue to append to joints.

# Before
def add_sensor_attachments(self, joints: list, attach_dict: dict, base_points: dict):
    ...
    joints.append(link)  # bug: link element in joints list

# After
def add_sensor_attachments(self, links: list, joints: list, attach_dict: dict, base_points: dict):
    ...
    links.append(link)   # link elements go to links
    joints.append(joint) # joint elements go to joints

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