Shell snapshot generation duplicates alias '--' causing 'alias: --: not found' error

Bug Report

Description:
Claude Code shell snapshots incorrectly duplicate the '--' delimiter in alias commands, causing bash errors.

Steps to reproduce:

1. Have an alias in shell config like: alias -- -='cd -'
2. Run any Claude Code command
3. Error appears: alias: --: not found

Expected behavior:
Alias should be preserved as: alias -- -='cd -'

Actual behavior:
Claude generates: alias -- -- -='cd -' (note the duplicate --)

Environment:

• macOS
• Bash shell
• Alias defined in ~/.aliases file

Workaround:
Comment out the problematic alias or use alternative syntax.

Files affected:
Shell snapshot files like: /Users/lightwing/.claude/shell-snapshots/snapshot-bash-*.sh