Refresh HolonomicController when wheel geometry changes

[sylvesterkaczmarek]

Description

Make HolonomicController refresh its cached controller when wheel geometry inputs change at runtime.

The node currently copies wheelRadius, wheelPositions, wheelOrientations, mecanumAngles, wheelAxis, and upAxis only during its first initialization. This means a graph that retargets HolonomicRobotUsdSetup to another robot can supply new wheel geometry while HolonomicController continues computing commands with the previous robot's geometry.

When an initialized node detects a change in any wheel-geometry input, mark the cached controller uninitialized and reuse the existing validation/initialization path to rebuild it. Steady-state behavior is unchanged when geometry inputs are stable.

Validation

• regression test evaluates the controller with 0.04 m wheel radii
• doubles all wheel radii to 0.08 m without resetting the graph
• verifies the next evaluation immediately uses the new geometry and halves the required wheel angular velocities
• existing initialization and validation path is reused unchanged
• production diff is ten lines