Plugin installer uses /home/<username> instead of actual $HOME for non-standard home directories

Description

When installing a plugin from the official marketplace, the plugin installer constructs the source path using /home/<username> instead of the user's actual home directory. This fails on systems where the home directory is not under /home/.

Environment

• Claude Code version: 2.1.45
• OS: Linux (aarch64)
• Shell: zsh
• Home directory: A non-standard path (not under /home/, e.g. /data/myuser)

Steps to reproduce

1. Have a Linux user whose home directory is not under /home/ (e.g., /data/myuser — correctly set in both $HOME and /etc/passwd)
2. Run /plugin install claude-md-management@claude-plugins-official

Expected behavior

The installer should resolve the plugin source path using the actual home directory ($HOME or the value from getent passwd).

Actual behavior

Error: Failed to install: Source path does not exist: /home/myuser/.claude/plugins/marketplaces/claude-plugins-official/plugins/claude-md-management

The marketplace data is correctly stored at the real home directory, but the installer hardcodes or incorrectly resolves the home to /home/<username>.

Additional context

• $HOME is correctly set to the non-standard path
• /etc/passwd also has the correct home directory
• The marketplace was successfully synced to the correct path under the real $HOME
• Only the plugin install step uses the wrong /home/<username> path
• Workaround: sudo ln -s /data/myuser /home/myuser