Postgres engine: open constructor, PgOpts, pool + listener wiring — forwarder skeleton with the POC-pinned pitfalls structurally excluded, seam error mappings, wave-3 stub surface (task pg-engine-open-opts)

alkstore-postgres/Cargo.toml

@@ -7,10 +7,11 @@ repository.workspace = true
 
 [dependencies]
 alkstore = { version = "0.1", path = "../alkstore" }
-tokio = { version = "1", features = ["rt-multi-thread", "macros"] }
-tokio-postgres = "0.7"
 deadpool-postgres = "0.14"
+serde_json = "1"
 thiserror = "2"
+tokio = { version = "1", features = ["rt-multi-thread", "macros", "sync", "time"] }
+tokio-postgres = "0.7"
 
 [dev-dependencies]
 alkstore-contract-suite = { path = "../alkstore-contract-suite" }