v0.6.108
Replace asherah memguard/memcall with hardware-enclave memory primitives
This release removes ~1900 lines of bespoke memory protection code (memguard.rs + memcall.rs) and replaces them with a dependency on hardware-enclave v0.1.5, which provides the same SecureBuffer, MemoryEnclave, TieredPool, LockedBuffer, and harden_process primitives as the canonical implementation.