fix(install): forward granular --unstable-* flags (#22164)

Closes #22154

cli/tools/installer.rs

@@ -382,6 +382,10 @@ async fn resolve_shim_data(
     executable_args.push("--unstable".to_string());
   }
 
+  for feature in &flags.unstable_config.features {
+    executable_args.push(format!("--unstable-{}", feature));
+  }
+
   if flags.no_remote {
     executable_args.push("--no-remote".to_string());
   }
@@ -706,6 +710,73 @@ mod tests {
     );
   }
 
+  #[tokio::test]
+  async fn install_unstable_legacy() {
+    let shim_data = resolve_shim_data(
+      &Flags {
+        unstable_config: UnstableConfig {
+          legacy_flag_enabled: true,
+          ..Default::default()
+        },
+        ..Default::default()
+      },
+      &InstallFlags {
+        module_url: "http://localhost:4545/echo_server.ts".to_string(),
+        args: vec![],
+        name: None,
+        root: Some(env::temp_dir().to_string_lossy().to_string()),
+        force: false,
+      },
+    )
+    .await
+    .unwrap();
+
+    assert_eq!(shim_data.name, "echo_server");
+    assert_eq!(
+      shim_data.args,
+      vec![
+        "run",
+        "--unstable",
+        "--no-config",
+        "http://localhost:4545/echo_server.ts",
+      ]
+    );
+  }
+
+  #[tokio::test]
+  async fn install_unstable_features() {
+    let shim_data = resolve_shim_data(
+      &Flags {
+        unstable_config: UnstableConfig {
+          features: vec!["kv".to_string(), "cron".to_string()],
+          ..Default::default()
+        },
+        ..Default::default()
+      },
+      &InstallFlags {
+        module_url: "http://localhost:4545/echo_server.ts".to_string(),
+        args: vec![],
+        name: None,
+        root: Some(env::temp_dir().to_string_lossy().to_string()),
+        force: false,
+      },
+    )
+    .await
+    .unwrap();
+
+    assert_eq!(shim_data.name, "echo_server");
+    assert_eq!(
+      shim_data.args,
+      vec![
+        "run",
+        "--unstable-kv",
+        "--unstable-cron",
+        "--no-config",
+        "http://localhost:4545/echo_server.ts",
+      ]
+    );
+  }
+
   #[tokio::test]
   async fn install_inferred_name_from_parent() {
     let shim_data = resolve_shim_data(