feat(history): add Atuin context scopes

internal/config/config_test.go

@@ -30,6 +30,9 @@ func TestDefaultConfigAndState(t *testing.T) {
 	if !cfg.Core.CobraProbeEnabled {
 		t.Errorf("expected cobra probing to be enabled by default")
 	}
+	if cfg.History.Scope != "global" {
+		t.Errorf("expected global history scope, got %q", cfg.History.Scope)
+	}
 
 	// test manual provider registration
 	cfg.AI.Provider = "custom"
@@ -207,6 +210,21 @@ func TestValidateAutoUpdateRange(t *testing.T) {
 	}
 }
 
+func TestValidateHistoryScope(t *testing.T) {
+	cfg := DefaultConfig()
+	for _, scope := range []string{"global", "directory", "workspace", "hybrid"} {
+		cfg.History.Scope = scope
+		if err := validate(cfg); err != nil {
+			t.Errorf("expected history scope %q to be valid: %v", scope, err)
+		}
+	}
+
+	cfg.History.Scope = "session"
+	if err := validate(cfg); err == nil {
+		t.Error("expected unsupported history scope to be rejected")
+	}
+}
+
 func TestLoadSave(t *testing.T) {
 	tmpDir, err := os.MkdirTemp("", "iris-config-test")
 	if err != nil {