Add MuJoCo/BSK_Sim thruster arm control example

[Will-Schwend]

• Review: By commit
• Merge strategy: Merge (no squash)

Description

This PR adds a new MuJoCo example scenario, examples/mujoco/scenarioThrArmControl.py, along with MuJoCo-specific BSK-style master/model wiring and support modules for thruster-on-arm control.

Approach taken:

• Added new example scneario file scenarioThrArmControl.py
• Added MuJoCo BSK scaffolding:
  • examples/mujoco/BSK_mujocoMasters.py
  • examples/mujoco/mujocoModels/BSK_MujocoDynamics.py
  • examples/mujoco/mujocoModels/BSK_MujocoFSW.py
• Added python modules in examples/mujoco/thrArmControlSupport:
  • jointThrAllocation.py
  • thrFiringRound.py
  • stateMerge.py
• Removed unneeded variable from inertialCartFeedback

Verification

Validation artifacts included in this branch:

• test_scenarioMujoco.py runs the new scenario.

Test intent:

• Assert test runs and produces figures for documentation.

Documentation

Documentation updated for all added components:

• examples/mujoco/scenarioThrArmControl.py (scenario narrative and figures in docstring)
• examples/_default.rst (scenario indexing)
• docs/source/Support/bskReleaseNotes.rst (release-note entries)

[Will-Schwend]

@codex review

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