enprot 0.4.1

Engyon Protected Text (EPT) — confidentiality processor and capability ledger
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# 39 — Zeroize secrets on drop

**Priority**: P1
**Status**: specified

Add `zeroize` crate. Implement `Drop for ParseOps` that zeros
passwords and recipient PEMs on drop. No type changes needed —
`Zeroize` trait works on `&mut String` in place.