feat!: move Unitree production tasks downstream

[TATP-233]

Summary

• Move the requested Unitree production task families out of UniLab and into the downstream unitree_rl_unilab package.
• Remove their UniLab task modules, registry entries, owner YAML, task-specific tests, robot metadata, migration/support-matrix claims, benchmark defaults, drift evidence, and documentation claims.
• Retain UniLab's Manager-Based runtime, common cross-robot terms, backend/training contracts, and the retained G1 reference paths.
• Update bilingual docs and the generated support matrix to use retained UniLab tasks first and record downstream ownership only as an ecosystem boundary.
• Downstream implementation, all 95 owner/base YAML files, direct robot assets, tests, packaging, and public-PyPI-only upstream dependency policy are committed directly on unilabsim/unitree_rl_unilab main (migration b975322, CI parser fix 686f337).

This is a breaking task-name migration: downstream tasks use Unitree* registry names. Existing checkpoints require an explicit old run-directory selection.

Linked Work

• Issue: UniLab discussion 调研：从 mjlab / unitree_rl_mjlab 分工看 UniLab Manager-Based API 边界与 Unitree 任务外迁 #1576 (调研：从 mjlab / unitree_rl_mjlab 分工看 UniLab Manager-Based API 边界与 Unitree 任务外迁 #1576)
• Parent roadmap: N/A
• Roadmap declared base: N/A
• Milestone: N/A
• Base branch: main
• Downstream direct migration commit: unilabsim/unitree_rl_unilab@b975322
• Downstream current main / CI head: unilabsim/unitree_rl_unilab@686f337

Validation

• make test-all passed on the final local head before this PR was created or updated
• Additional task-specific validation listed below

Commands actually run:

make check
make test
make test-all
uv run pytest tests/scripts/test_check_docs.py -q
cd docs/sphinx && UNILAB_DOCS_SKIP_AUTODOC=1 uv run --no-project --with-requirements requirements.txt sphinx-build -b html -n source build/html

Final-head make test-all result: 1479 passed, 26 skipped, 657 deselected; benchmark import smoke passed with only the platform-optional MLX entry skipped.

Downstream local validation on unitree_rl_unilab@b975322, followed by a fresh mypy check on 686f337:

uv run --project ../UniLab pytest tests -q
uv run --project ../UniLab ruff check src tests
uv run --project ../UniLab ruff format --check src tests
uv run --project ../UniLab mypy --config-file pyproject.toml src
uv lock --check
uv build

Downstream result: 50 tests passed; lint/format/type/lock/build passed. MuJoCo loaded A2, G1, Go1, Go2, and Go2W directly packaged models and stepped 23-DoF G1 walk/motion owners. Current-main remote CI at 686f337 completed successfully: https://github.com/unilabsim/unitree_rl_unilab/actions/runs/34951091045.

Remote CI route:

• Base main: current head f10199e0 — all applicable checks passed (7 successful, 1 docs-deploy skip): https://github.com/Motphys/UniLab/actions/runs/34950250198 and https://github.com/Motphys/UniLab/actions/runs/34950250120

Impact

• Backend impact: mujoco / motrix
• Platform impact: Linux
• Training effect expected: yes — migrated task IDs are removed from UniLab and replaced by downstream Unitree* IDs

Artifacts

• W&B: N/A
• benchmark result: N/A
• video / screenshot: N/A
• ONNX / checkpoint: N/A

Checklist

• Added or updated tests where needed
• Updated docs if behavior or workflow changed
• Linked the driving issue
• Noted any follow-up work explicitly

Follow-up: downstream license provenance should be documented for the directly committed robot meshes/textures.