Surface mkdir failures in scripts/install.sh

[ametel01]

Summary

• install_binary now fails immediately with a clear error when mkdir -p cannot create the install directory, instead of suppressing the error with 2>/dev/null || true.

Test plan

• Verified manually: running with ATB_INSTALL_DIR=/nonexistent/deep/path now shows the mkdir failure directly
• Normal install path continues to work as before

Closes #9

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d3b10c23-e39a-457f-967f-5b606a737774

📥 Commits

Reviewing files that changed from the base of the PR and between 65c4755 and 84df442.

📒 Files selected for processing (2)

• CHANGELOG.md
• scripts/install.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/9-surface-mkdir-failures-install-sh

📝 Coding Plan

• Generate coding plan for human review comments

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