fix: livrable tickets #70 #100 #102 — UX surface scoping

- #70: implémentation suppression modèles locaux téléchargés
- #100: correction scroll OpenCode
- #102: correction fit TUI après switch/layout
- memory note scoping UX

crates/infrastructure/tests/model_server.rs

@@ -8,8 +8,8 @@ use domain::model_server::{
     LocalModelServerKind, ModelPath, ModelServerEndpoint, ModelSource, StopPolicy,
 };
 use domain::ports::{
-    FileSystem, ModelArtifactCancel, ModelArtifactDownloader, ModelServerRegistry,
-    ModelServerRuntime, RemotePath,
+    FileSystem, ModelArtifactCancel, ModelArtifactDownloader, ModelArtifactState,
+    ModelServerRegistry, ModelServerRuntime, RemotePath,
 };
 use domain::LocalModelServerId;
 use infrastructure::{
@@ -227,3 +227,41 @@ async fn hf_model_artifact_downloader_resolves_deterministic_local_cache_hit_wit
         std::path::Path::new("Qwen--Qwen3-Coder").join("Q4_K_M.gguf")
     );
 }
+
+#[tokio::test]
+async fn hf_model_artifact_downloader_reports_downloaded_cache_state() {
+    let tmp = TempDir::new();
+    let downloader = HfModelArtifactDownloader::new(tmp.path());
+    let repo = HfModelRef::new("Qwen/Qwen3-Coder:Q4_K_M").unwrap();
+    let path = downloader.cache_path_for(&repo);
+    std::fs::create_dir_all(path.parent().unwrap()).unwrap();
+    std::fs::write(&path, b"gguf").unwrap();
+
+    let state = downloader.hf_model_state(&repo).await.unwrap();
+
+    assert_eq!(
+        state,
+        ModelArtifactState::Downloaded {
+            path: ModelPath::new(path.to_string_lossy()).unwrap(),
+            size_bytes: Some(4),
+        }
+    );
+}
+
+#[tokio::test]
+async fn hf_model_artifact_downloader_deletes_merged_cache_without_config_side_effects() {
+    let tmp = TempDir::new();
+    let downloader = HfModelArtifactDownloader::new(tmp.path());
+    let repo = HfModelRef::new("Qwen/Qwen3-Coder:Q4_K_M").unwrap();
+    let path = downloader.cache_path_for(&repo);
+    std::fs::create_dir_all(path.parent().unwrap()).unwrap();
+    std::fs::write(&path, b"gguf").unwrap();
+
+    downloader.delete_hf_model(&repo).await.unwrap();
+
+    assert!(!path.exists());
+    assert_eq!(
+        downloader.hf_model_state(&repo).await.unwrap(),
+        ModelArtifactState::Missing
+    );
+}