feat: complete M3 runtime snapshot and profile save archive

server-rs/crates/spacetime-module/Cargo.toml

@@ -9,6 +9,7 @@ crate-type = ["cdylib"]
 
 [dependencies]
 log = { workspace = true }
+serde_json = "1"
 module-ai = { path = "../module-ai", default-features = false, features = ["spacetime-types"] }
 module-assets = { path = "../module-assets", default-features = false, features = ["spacetime-types"] }
 module-combat = { path = "../module-combat", default-features = false, features = ["spacetime-types"] }