Add change password functionality

Adding a change password functionality would be better .

No files, tests, or stack details are provided, so begin by reading the repository README and directory layout to find where user accounts, login, and credential checks are implemented. Then trace that auth/account flow to identify where a new CLI change-password path should be added and how password data is validated and persisted. Run the project’s standard test/build command before and after changes; completion means there is a working change-password flow with clear success/failure outcomes for a user.

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