chore(deps): remove unused mmcv and mmengine dependencies

[spomichter]

Summary

Remove mmcv from dependencies — it was a leftover from the dead Detic integration (import commented out, directory excluded from mypy). Zero imports anywhere in the codebase.

Eliminates a slow source build from uv sync.

Verification

• AST-parsed every .py file — no mmcv/mmengine imports
• grep -rn mmcv only hits pyproject.toml and egg-info
• Local pytest: 967 passed, 6 skipped
• Local mypy: 636 files, no issues

[greptile-apps]

Greptile Summary

Removed the unused mmcv dependency from the cuda extras group. This dependency was a leftover from the discontinued Detic integration (which is now commented out at dimos/perception/detection/detectors/__init__.py:1 and excluded from mypy checks).

• Removed mmcv>=2.1.0 from [project.optional-dependencies.cuda]
• Removed mmcv from [tool.uv.no-build-isolation-package] config
• Updated uv.lock to reflect the removal

The PR author verified zero imports exist in the codebase and confirmed all tests pass (967 passed, 6 skipped) with no mypy issues. This change eliminates a slow source build during uv sync, improving developer experience.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change only removes an unused dependency with zero imports in the codebase, verified by both AST parsing and grep searches. The dependency was a leftover from discontinued Detic integration. All tests pass (967 passed, 6 skipped) and mypy reports no issues across 636 files. The change is purely additive in terms of removing build overhead.
• No files require special attention

Important Files Changed

Filename	Overview
pyproject.toml	Removed unused mmcv dependency from cuda extra and no-build-isolation-package config
uv.lock	Lockfile updated to remove mmcv package and its references from dependency tree

_{Last reviewed commit: 0cd24d3}

[greptile-apps]

_{2 files reviewed, no comments}

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