docs(minimax-multimodal-toolkit): clarify sandbox env setup

[JithendraNara]

What

• clarify in minimax-multimodal-toolkit that exporting MINIMAX_API_KEY or MINIMAX_API_HOST to ~/.zshrc / ~/.bashrc may not affect an already-running sandboxed agent session
• tell users to restart the IDE/agent after updating their shell profile, or configure the variables in the tool's own environment settings when available
• make scripts/check_environment.sh print sandbox-aware remediation instead of only suggesting export ...

Why

Issue #41 reports a real usability gap: users can follow the current instructions, save MINIMAX_API_KEY to their shell profile, and still see the skill fail inside a sandboxed agent runtime because the running app never inherited the new environment.

This PR is scoped to one documentation/runtime-guidance improvement in minimax-multimodal-toolkit: make the missing-key path actionable for sandboxed AI tools.

Fixes #41

[Copilot]

Pull request overview

Improves the MiniMax multimodal skill setup guidance to account for sandboxed AI runtimes where updating shell profiles doesn’t affect already-running IDE/agent sessions, and updates the environment check script to print actionable sandbox-aware remediation.

Changes:

• Added “sandboxed agent” guidance to SKILL.md for both MINIMAX_API_HOST and MINIMAX_API_KEY setup.
• Updated the “missing key/host” remediation steps to explicitly mention restarting the IDE/agent or configuring env vars in tool-specific settings.
• Enhanced scripts/check_environment.sh failure messages to include sandbox-aware troubleshooting (restart / tool env settings).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
skills/minimax-multimodal-toolkit/SKILL.md	Adds sandbox-aware setup notes and remediation steps for API host/key configuration.
skills/minimax-multimodal-toolkit/scripts/check_environment.sh	Improves missing env var failure output to guide users in sandboxed runtimes.

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[JithendraNara]

Fresh recheck on current main: the sandbox-aware environment guidance from this PR now appears to already be present upstream in both places this PR changes.

I verified current main includes:

• the sandbox/restart guidance in skills/minimax-multimodal-toolkit/SKILL.md
• the sandbox-aware remediation lines in skills/minimax-multimodal-toolkit/scripts/check_environment.sh

Given that, this PR looks functionally superseded by current main even though it is still open. If maintainers agree, I think it can be closed without losing the user-facing guidance.