fix(metric3d): remove metric3d to fix tests

[paul-nechifor]

Problem

Tests were broken.

Closes DIM-568

https://linear.app/dimensional/issue/DIM-568/remove-metric3d

Solution

Remove Metric3D. It was only used by the drone and not used for anything useful.

Breaking Changes

None.

How to Test

Run all the tests.

Note: I can't check with the physical drone.

Contributor License Agreement

• I have read and approved the CLA.

[greptile-apps]

Greptile Summary

Removes Metric3D depth estimation model and all associated code to fix broken tests. This PR deletes the entire dimos.environment and dimos.models.depth modules, removes depth processing from drone and Unitree camera modules, and cleans up all references from module registries. The removal is comprehensive and affects 13 files with approximately 700 lines of code deleted.

• Deleted dimos/environment/ module (178 lines) - abstract Environment class
• Deleted dimos/models/depth/metric3d.py (187 lines) and its tests (102 lines)
• Deleted dimos/robot/unitree/depth_module.py (243 lines)
• Updated dimos/robot/drone/camera_module.py to remove depth processing, eliminating depth_image and depth_colorized output channels
• Removed depth-related LCM transports from dimos/robot/drone/drone.py
• Cleaned up module registries in all_blueprints.py and unitree_webrtc/__init__.py
• Deleted binary ONNX model file metric3d_vit_small.onnx
• Updated documentation to reflect removal of depth estimation features

All references to Metric3D, the environment module, and depth_module have been successfully removed with no remaining imports found in the codebase.

Confidence Score: 5/5

• This PR is safe to merge - it's a clean removal with no broken references
• The removal is complete and thorough with no remaining imports or references to the deleted code. All module registries have been updated, documentation reflects the changes, and the scope is well-defined (fixing broken tests by removing unused Metric3D functionality).
• No files require special attention

Important Files Changed

Filename	Overview
dimos/models/depth/metric3d.py	Deleted Metric3D depth estimation model implementation (187 lines)
dimos/robot/all_blueprints.py	Removed depth_module from all_modules registry
dimos/robot/drone/camera_module.py	Removed Metric3D depth processing logic and depth output channels
dimos/robot/unitree/depth_module.py	Deleted Unitree depth module that used Metric3D (243 lines)
dimos/robot/unitree_webrtc/init.py	Removed depth_module from module alias registry

_{Last reviewed commit: 7e0610e}

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