Adds *KS variant functions that delegate crypto operations to the
Enchantrix keyserver — key material never leaves the keyserver boundary.
- tim: ToSigilKS, FromSigilKS, CacheKS, RunEncryptedKS
- smsg: EncryptKS, DecryptKS, EncryptV3KS, DecryptV3KS
- stmf: DecryptKS, GenerateKeyPairKS
All variants are backward-compatible with existing password-based APIs.
Adds testify dependency for integration tests.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
cb64050704