[tiny-agents] Handle env variables in tiny-agents (Python client) (#3129)
* [tiny-agents] forward local env variables
* Approximately follow VSCode convention
* Update src/huggingface_hub/inference/_mcp/cli.py
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>