[MacOS Bug] unitree-g1-nav-sim fails to start due to invalid simulation=True config

Description

unitree-g1-nav-sim fails during blueprint construction because it sets simulation=True, while GlobalConfig.simulation expects a string.

Environment

• DimOS: v0.0.14b1
• macOS: 26.4.1
• Architecture: Apple Silicon (arm64)
• Python: 3.12.13

Steps to reproduce

uv run dimos run unitree-g1-nav-sim

Actual behavior

The blueprint fails during startup with:

ValidationError: 1 validation error for GlobalConfig

simulation
  Input should be a valid string
  input_value=True
  input_type=bool

The traceback shows the failure occurs while applying blueprint global config during:

ModuleCoordinator.build(...)
global_config.update(...)

Root cause

The blueprint currently contains:

.global_config(n_workers=8, robot_model="unitree_g1", simulation=True)

at:

dimos/robot/unitree/g1/blueprints/navigation/unitree_g1_nav_sim.py:88

GlobalConfig.simulation expects a string rather than a boolean.

Expected behavior

unitree-g1-nav-sim should build successfully and start the simulation without a config validation error.

Suggested fix

Update the blueprint to pass the expected string value for simulation instead of:

simulation=True

and add/update a blueprint startup test so this config mismatch is caught automatically.

Start at dimos/robot/unitree/g1/blueprints/navigation/unitree_g1_nav_sim.py:88 and inspect the GlobalConfig.simulation type. Run uv run dimos run unitree-g1-nav-sim to reproduce the validation failure, then add or update the blueprint startup test mentioned in the issue. Done means the blueprint builds and starts without the simulation configuration error.