Switch classifier sessions onto bread-onnx v0.7.2

Replace local ort Session::builder/ROCm wiring with bread_onnx::build_session
(MIGraphX + CPU fallback, same pin as breadmill). Drop the breadman
chip/init_adw shim now that bread-theme v0.7.4 exports those helpers.

breadpad-shared/Cargo.toml

@@ -20,7 +20,7 @@ tokio.workspace = true
 zbus.workspace = true
 ort.workspace = true
 tokenizers.workspace = true
-ndarray.workspace = true
+bread-onnx = { git = "https://git.breadway.dev/Breadway/bread-ecosystem", tag = "v0.7.2" }
 toml.workspace = true
 dirs.workspace = true
 regex.workspace = true