PHX Toolbox 1.0.3 (technical preview)

• removed unwanted dependency on Robotics Toolbox
• improved viewer usability (published Axes and Figure properties)
• new interaction element phx.Buoyancy
• new demos using phx.Buoyancy: phxex_buoyancy, phxex_capsize, phxex_gyrostab
• fixed joint (phx.FixedJoint) updated and promoted from development do production state
• updated phxex_joints demo
• reworked detection subsystem in the phxex_sim_sorter demo
• polished demos phxex_jenga, phxex_jenga_free, phxex_buggy
• updated documentation and skills for AI agents