d0b8678eb5
Reviewer found a password like aA1!@#%^&*()_-+={}[] becomes
aA1!@#%^__ADMIN_PW__*()_-+={}[] because sed expands & to matched
pattern. Two layers of defense:
1. validate_pw rejects & | / newline at input
2. sed_escape() helper escapes any remaining special chars before
substitution
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