ubl-crypto 0.1.0

UBL crypto helpers: SK wrapper, KID, HMAC, did:key, batch verify for Universal Business Ledger.
Documentation
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## P3 (0.3.0) — Feito
- `Keypair` e utilitários `did_key_{encode,decode}`
- `hmac_sign`, `hmac_verify`
- `verify_many` (batch)

## P4 (0.4.0) — Planejado
- Rotação KID com período de graça
- AEAD (XChaCha20-Poly1305) envelopes
- Providers KMS: file/env/stub vault