chore: pick up cadcodec 5b682ed (upstream acadrust sync) and cadkernel 6f046af

acadrust follows hakanaktt/acadrust main through #107, entity-record
passthrough included; cadkernel pins the same codec rev so one acadrust
stays in the graph. Upstream added BlockFlags::is_xref_unloaded, which
XATTACH now sets to false for a freshly attached reference.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

crates/ocs_plugin_api/Cargo.toml

@@ -14,7 +14,7 @@ serde = { version = "1", features = ["derive"] }
 # Pulled in only by the `host` feature, which adds the `acadrust`-typed
 # `HostApi` runtime surface. The default crate stays dependency-free so engine
 # crates and external tooling can depend on the manifest/ribbon contract cheaply.
-acadrust = { git = "https://github.com/HakanSeven12/cadcodec.git", rev = "7ea4247", optional = true, features = ["serde"] }
+acadrust = { git = "https://github.com/HakanSeven12/cadcodec.git", rev = "5b682ed", optional = true, features = ["serde"] }
 
 # Runtime IPC and serialization (host feature only).
 interprocess = { version = "2", optional = true }
@@ -38,7 +38,7 @@ serde_json = "1"
 serde = { version = "1", features = ["derive"] }
 cargo-lock = "11"
 # acadrust is scanned at build time to generate the embedded type registry.
-acadrust = { git = "https://github.com/HakanSeven12/cadcodec.git", rev = "7ea4247", features = ["serde"] }
+acadrust = { git = "https://github.com/HakanSeven12/cadcodec.git", rev = "5b682ed", features = ["serde"] }
 
 [dev-dependencies]
 serde_json = "1"