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Check for group presence after full initialization ( 1839)

Check for group presence after full initialization ( 1839): a task in repo2rlenv-commit-runtime-v2 (Harbor dataset). Title: Panic when subcommand with GroupID is added before the group is registered via AddGroup

The task

**Title:** Panic when subcommand with GroupID is added before the group is registered via `AddGroup`

Part of FineEnvs/repo2rlenv-commit-runtime.