feat: implement v0.6.0 mutation engine and db_type runtime selection

shared/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "shared"
-version = "0.5.0"
+version = "0.6.0"
 edition = "2021"
 
 [dependencies]
@@ -10,4 +10,4 @@ blake3 = "1"
 hex = "0.4"
 base64 = "0.22"
 rand = "0.8"
-ed25519-dalek = { version = "2", features = ["rand_core"] }
+ed25519-dalek = { version = "2", features = ["rand_core"] }