Uses corrected Claude CLI subcommand shape:
claude plugin marketplace add <repo> (NOT `claude marketplace add`)
claude plugin marketplace list
claude plugin install <name@marketplace>
claude plugin info <name@marketplace> --json
Includes fallback for environments where `claude` CLI is not in PATH
(VSCode-extension install on Windows): logs manual edit instructions
and exits 0 so the parent installer can continue.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>