Add embodichain-new-task CLI for task environment scaffolding

[yuecideng]

Description

This PR adds the embodichain-new-task console command and embodichain.toolkits.scaffold package to generate EmbodiChain task environments from Jinja2 templates.

The CLI supports:

• Targets: in-repo (embodichain/lab/gym/envs/tasks/...) or external extension projects
• Workflows: expert demo (EmbodiedEnv), RL (RLEnv), and config-only env classes
• Outputs: task Python module, gym JSON config, pytest stub, optional extension pyproject.toml / README / run_env.py
• Post-processing: patches tasks/__init__.py for in-repo tasks and can run black on generated files

skills/add-task-env/SKILL.md documents the preferred CLI workflow before manual scaffolding.

Dependencies: jinja2>=3.1.0 (added to pyproject.toml).

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which improves an existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (existing functionality will not work without user modification)
• Documentation update

Screenshots

N/A

Checklist

• I have run the black . command to format the code base.
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Dependencies have been updated, if applicable.

Test plan

• pip install -e . and verify embodichain-new-task --help
• embodichain-new-task --target inrepo --workflow demo --category special --name scaffold_smoke --gym-id ScaffoldSmoke-v0 --dry-run
• pytest tests/toolkits/scaffold/test_scaffold.py

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