cua_s1: load and validate native vision checkpoints on CPU

src/models/cua_s1/native/Cargo.toml

@@ -18,6 +18,7 @@ omni-qwen3-5-native = { path = "../../qwen3_5/native" }
 omni-runtime = { path = "../../../runtime" }
 memmap2 = "0.9.9"
 safetensors = "0.8.0"
+serde = { version = "1", features = ["derive"] }
 serde_json = { version = "1.0.149", features = ["float_roundtrip", "preserve_order"] }
 # the onig regex backend, as in the Python tokenizers wheel
 tokenizers = { version = "=0.22.2", default-features = false, features = ["onig"] }

src/models/cua_s1/native/src/lib.rs

@@ -7,3 +7,4 @@ pub use omni_qwen3_5_native::{cuda, json, model};
 pub mod engine;
 pub mod executor;
 pub mod processing;
+pub mod vision;