fix: resolve model aliases before syntax validation

Fixes alias resolution ordering: aliases (opus/sonnet/haiku) are now resolved to their full provider/model form BEFORE syntax validation. Previously, aliases bypassed validation via an early-return check. Also adds the 'log' crate for debug tracing of alias resolution and wraps PermissionsExt import in #[cfg(unix)] for portability.

rust/crates/rusty-claude-cli/tests/cli_flags_and_config_defaults.rs

@@ -31,7 +31,7 @@ fn status_command_applies_model_and_permission_mode_flags() {
     assert_success(&output);
     let stdout = String::from_utf8(output.stdout).expect("stdout should be utf8");
     assert!(stdout.contains("Status"));
-    assert!(stdout.contains("Model            claude-sonnet-4-6"));
+    assert!(stdout.contains("Model            anthropic/claude-sonnet-4-6"));
     assert!(stdout.contains("Permission mode  read-only"));
 
     fs::remove_dir_all(temp_dir).expect("cleanup temp dir");

rust/crates/rusty-claude-cli/tests/compact_output.rs

@@ -239,7 +239,7 @@ stderr:
         "Mock streaming says hello from the parity harness."
     );
     assert_eq!(parsed["compact"], true);
-    assert_eq!(parsed["model"], "claude-sonnet-4-6");
+    assert_eq!(parsed["model"], "anthropic/claude-sonnet-4-6");
     assert!(parsed["usage"].is_object());
 
     fs::remove_dir_all(&workspace).expect("workspace cleanup should succeed");

rust/crates/rusty-claude-cli/tests/mock_parity_harness.rs

@@ -1,7 +1,7 @@
 use std::collections::BTreeMap;
 use std::fs;
 use std::io::Write;
-use std::os::unix::fs::PermissionsExt;
+
 use std::path::{Path, PathBuf};
 use std::process::{Command, Output, Stdio};
 use std::sync::atomic::{AtomicU64, Ordering};
@@ -426,11 +426,15 @@ fn prepare_plugin_fixture(workspace: &HarnessWorkspace) {
         "#!/bin/sh\nINPUT=$(cat)\nprintf '{\"plugin\":\"%s\",\"tool\":\"%s\",\"input\":%s}\\n' \"$CLAWD_PLUGIN_ID\" \"$CLAWD_TOOL_NAME\" \"$INPUT\"\n",
     )
     .expect("plugin script should write");
-    let mut permissions = fs::metadata(&script_path)
-        .expect("plugin script metadata")
-        .permissions();
-    permissions.set_mode(0o755);
-    fs::set_permissions(&script_path, permissions).expect("plugin script should be executable");
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        let mut permissions = fs::metadata(&script_path)
+            .expect("plugin script metadata")
+            .permissions();
+        permissions.set_mode(0o755);
+        fs::set_permissions(&script_path, permissions).expect("plugin script should be executable");
+    }
 
     fs::write(
         manifest_dir.join("plugin.json"),

rust/crates/rusty-claude-cli/tests/resume_slash_commands.rs

@@ -108,7 +108,7 @@ fn status_command_applies_cli_flags_end_to_end() {
 
     let stdout = String::from_utf8(output.stdout).expect("stdout should be utf8");
     assert!(stdout.contains("Status"));
-    assert!(stdout.contains("Model            claude-sonnet-4-6"));
+    assert!(stdout.contains("Model            anthropic/claude-sonnet-4-6"));
     assert!(stdout.contains("Permission mode  read-only"));
 }
 
@@ -289,7 +289,7 @@ fn resumed_status_surfaces_persisted_model() {
     let session_path = temp_dir.join("session.jsonl");
 
     let mut session = workspace_session(&temp_dir);
-    session.model = Some("claude-sonnet-4-6".to_string());
+    session.model = Some("anthropic/claude-sonnet-4-6".to_string());
     session
         .push_user_text("model persistence fixture")
         .expect("write ok");
@@ -317,7 +317,7 @@ fn resumed_status_surfaces_persisted_model() {
     let parsed: Value = serde_json::from_str(stdout.trim()).expect("should be json");
     assert_eq!(parsed["kind"], "status");
     assert_eq!(
-        parsed["model"], "claude-sonnet-4-6",
+        parsed["model"], "anthropic/claude-sonnet-4-6",
         "model should round-trip through session metadata"
     );
 }