Add macOS CI runners (mypy + tests on Apple Silicon)

[dimos-bot]

Goal

Add macOS CI to the test matrix so we catch platform-specific issues (imports, path handling, binary deps) before they hit developers on Macs.

Approach

• Add a parallel macos-tests job to the existing docker.yml workflow
• Use GitHub-hosted macos-latest runner (M1 arm64, 3 CPU, 7GB RAM, 14GB SSD)
• No Docker containers — install uv directly, sync deps, run tests on bare metal
• Skip extras that have no macOS wheels: cuda, cpu, dds, unitree
• Run mypy + pytest (same markers as Linux: not (tool or mujoco))
• Gated on check-changes.outputs.tests == true (same trigger as Linux tests)

Storage Budget (14GB SSD)

• macOS image + preinstalled tools: ~5GB
• Repo checkout (no LFS): ~300MB
• Python venv (no cuda/nvidia): ~4-5GB
• Headroom: ~4GB

Extras Installed

--all-extras --no-extra cuda --no-extra cpu --no-extra dds --no-extra unitree

This gives us: agents, base, dev, docker, drone, manipulation, misc, perception, psql, sim, visualization, web.

Not in Scope

• macOS Intel runners (can add later)
• LFS data tests (pointer files only on CI, data tests are @slow)
• ROS-dependent tests (ROS not available on macOS)

Risk

• 14GB SSD is tight with torch (~800MB macOS CPU). Monitor disk usage.
• macOS minutes cost 10x Linux on private repos. Keep test suite lean.

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Synced from DIM-696