chore: adopt official curl installer for Claude Code CLI setup

[atxtechbro]

Git Statistics

• Files changed: 1
• Lines changed: 26 (10 additions, 16 deletions)

Summary

• switch installation to official curl script for Claude Code CLI
• remove node/npm prerequisites; add curl availability check
• keep version detection and setup guidance after install

[amazon-q-developer]

⏳ Code review in progress. Analyzing for code quality issues and best practices. You can monitor the review status in the checks section at the bottom of this pull request. Detailed findings will be posted upon completion.

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[amazon-q-developer]

Security Review Summary

This PR switches from npm-based installation to curl-based installation for Claude Code CLI. While this simplifies dependencies by removing Node.js/npm requirements, it introduces a critical security vulnerability.

Critical Issues Found:

1. Security Risk: Direct piping of curl output to bash without verification (CWE-494)
2. Resource Leak: Missing cleanup of temporary files

Recommendation:

The security vulnerability must be addressed before merge. The suggested fix downloads the script to a temporary file, performs basic validation, and ensures proper cleanup. This maintains the simplicity of the curl-based approach while adding essential security safeguards.

The change from npm to curl installation is otherwise sound and reduces system dependencies appropriately.

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[amazon-q-developer]

🛑 Security Vulnerability: Piping curl output directly to bash without verification creates a significant security risk. The script downloads and executes code from without any integrity checks, certificate validation, or content verification.

Suggested change

	if ! curl -fsSL https://claude.ai/install.sh | bash; then
	# Download and verify the install script before execution
	INSTALL_SCRIPT=$(mktemp)
	if ! curl -fsSL -o "$INSTALL_SCRIPT"; then
	echo -e "${RED}Failed to download Claude Code CLI installer. Please check your network connectivity.${NC}"
	rm -f "$INSTALL_SCRIPT"
	return 1
	fi
	# Basic verification - check if it looks like a shell script
	if ! head -1 "$INSTALL_SCRIPT" | grep -q "^#!/"; then
	echo -e "${RED}Downloaded installer does not appear to be a valid shell script.${NC}"
	rm -f "$INSTALL_SCRIPT"
	return 1
	fi
	echo "Installing Claude Code CLI via official install script..."
	if ! bash "$INSTALL_SCRIPT"; then
	echo -e "${RED}Failed to install Claude Code CLI. Please try again or check your network connectivity.${NC}"
	rm -f "$INSTALL_SCRIPT"

[amazon-q-developer]

Missing cleanup of temporary file. The temporary install script should be removed after execution to prevent leaving sensitive files on the filesystem.

Suggested change

	return 1
	fi
	return 1
	fi
	rm -f "$INSTALL_SCRIPT" # Clean up temporary file