fix shell risk gate dry-run flow for destructive git clean

pkg/tools/shell_test.go

@@ -0,0 +1,45 @@
+package tools
+
+import (
+	"testing"
+
+	"clawgo/pkg/config"
+)
+
+func TestApplyRiskGate_DryRunCanBeBypassedWithForce(t *testing.T) {
+	tool := &ExecTool{riskCfg: config.RiskConfig{
+		Enabled:          true,
+		AllowDestructive: true,
+		RequireDryRun:    true,
+		RequireForceFlag: false,
+	}}
+
+	msg, dryRun := tool.applyRiskGate("git clean -fd", true)
+	if msg != "" || dryRun != "" {
+		t.Fatalf("expected force=true to allow execution after dry-run step, got msg=%q dryRun=%q", msg, dryRun)
+	}
+}
+
+func TestApplyRiskGate_RequiresDryRunWithoutForce(t *testing.T) {
+	tool := &ExecTool{riskCfg: config.RiskConfig{
+		Enabled:          true,
+		AllowDestructive: true,
+		RequireDryRun:    true,
+		RequireForceFlag: false,
+	}}
+
+	msg, dryRun := tool.applyRiskGate("git clean -fd", false)
+	if msg == "" {
+		t.Fatal("expected dry-run block message")
+	}
+	if dryRun == "" {
+		t.Fatal("expected dry-run command")
+	}
+}
+
+func TestAssessCommandRisk_GitCleanIsDestructive(t *testing.T) {
+	assessment := assessCommandRisk("git clean -fd")
+	if assessment.Level != RiskDestructive {
+		t.Fatalf("expected git clean to be destructive, got %s", assessment.Level)
+	}
+}