Plugin update loses executable permission on .sh hook files

claude plugin update downloads plugin files without preserving the executable bit on .sh files. This causes hook execution to fail with:

Stop hook error: Failed with non-blocking status code: /bin/sh: 1:
/home/user/.claude/plugins/marketplaces/.../hooks/stop-hook.sh: Permission denied

Reproduction

1. Install a plugin with .sh hook files (e.g. ralph-loop from claude-plugins-official)
2. chmod +x the hook files manually so hooks work
3. Run claude plugin update claude-plugins-official@anthropic
4. Hook files lose +x → hooks fail with "Permission denied"

Expected behavior

claude plugin update should either preserve executable permissions on .sh files during download, or automatically chmod +x all .sh files after update.

Workaround

find ~/.claude/plugins/marketplaces -name "*.sh" -exec chmod +x {} \;

Needs to be re-run after every plugin update.

Environment

• Platform: Linux
• Affects all .sh files across all marketplace plugins