feat: alias mo optimize

[bevanjkay]

Summary

This creates an alias for mo optimise to mo optimize for British English.
Sorry, this change should have been included when #721 was opened.

Safety Review

• Does this change affect cleanup, uninstall, optimize, installer, remove, analyze delete, update, or install behavior?
• Does this change affect path validation, protected directories, symlink handling, sudo boundaries, or release/install integrity?
• If yes, describe the new boundary or risk change clearly.

Tests

• List the automated tests you ran.
• List any manual checks for high-risk paths or destructive flows.

Safety-related changes

• None.