Plugin installation uses incorrect home directory path on macOS (/home/<truncated_username> instead of /Users/<username>)

Description

The plugin system resolves the home directory incorrectly on macOS, causing all plugin operations (install, refresh, autoupdate) to fail.

Expected path: /Users/dawumnam/.claude/plugins/...
Actual path used: /home/dawum/.claude/plugins/...

Two issues:

1. Uses /home/ (Linux convention) instead of /Users/ (macOS convention)
2. Username is truncated — dawum instead of dawumnam

Environment

• OS: macOS (Darwin 25.3.0)
• Shell: zsh
• $HOME: /Users/dawumnam (correctly set)
• $USER: dawumnam (correctly set)

Steps to reproduce

1. Open Claude Code on macOS
2. Go to Plugins > Marketplaces > claude-plugins-official
3. Attempt to install any plugin (e.g., typescript-lsp)

Error

Error: Failed to install: Source path does not exist: /home/dawum/.claude/plugins/marketplaces/claude-plugins-official/plugins/typescript-lsp

Debug logs

[WARN] Cache corrupted or missing for marketplace claude-plugins-official, re-fetching from source: ENOENT: no such file or directory, open '/home/dawum/.claude/plugins/marketplaces/claude-plugins-official'
[ERROR] Failed to refresh marketplace claude-plugins-official: Failed to clone marketplace repository: fatal: could not create leading directories of '/home/dawum/.claude/plugins/marketplaces/claude-plugins-official': Operation not supported

Workaround attempted

Creating a symlink at /home/dawum/.claude → /Users/dawumnam/.claude is not possible because macOS manages /home via autofs, which blocks directory creation even with sudo.

Notes

The marketplace repo itself is correctly cloned to /Users/dawumnam/.claude/plugins/marketplaces/claude-plugins-official/, so some part of the system resolves $HOME correctly while the plugin install/refresh logic does not.