feat(cli): --allow-no-generator-actions

The flag the dead-run refusal names, wired through to the pipeline. The
property-free flag goes back to meaning what it says.

cmd/sanderling/main.go

@@ -38,6 +38,7 @@ type testOptions struct {
 	labelSource             string
 	exitOnViolation         bool
 	allowNoProperties       bool
+	allowNoGeneratorActions bool
 }
 
 const topUsage = `sanderling is a property-based UI fuzzer for mobile apps.
@@ -75,7 +76,8 @@ func parseTestArgs(args []string, stderr io.Writer) (testOptions, error) {
 	flagSet.StringVar(&options.generator, "generator", "seeded", "action generator: seeded (weighted random) or llm (model picks from the same candidate set; requires generator = llm() in the spec)")
 	flagSet.StringVar(&options.labelSource, "label-source", "visible-text", "how candidates are named to the llm generator: visible-text (what a user reads) or resource-id (the identifier the app assigned). The seeded generator picks by index and ignores this")
 	flagSet.BoolVar(&options.exitOnViolation, "exit-on-violation", false, "stop the run at the first property violation and exit 2, so CI can tell a found bug (2) from a broken harness (1)")
-	flagSet.BoolVar(&options.allowNoProperties, "allow-no-properties", false, "run a spec that registers no properties. Such a run judges nothing and can only report no violations, so it is refused by default; pass this when the run measures what the spec extracts or where the generator reaches")
+	flagSet.BoolVar(&options.allowNoProperties, "allow-no-properties", false, "run a spec that registers no properties. Such a run judges nothing and can only report no violations, so it is refused by default; pass this when the run measures what the spec extracts")
+	flagSet.BoolVar(&options.allowNoGeneratorActions, "allow-no-generator-actions", false, "finish a run the action generator never drove. Such a run judged whatever screen the spec's setup left it on and explored nothing, so it is refused by default; pass this when the run measures where the generator reaches and reaching nothing is the measurement")
 	if err := flagSet.Parse(args); err != nil {
 		return testOptions{}, err
 	}

cmd/sanderling/main_test.go

@@ -425,6 +425,38 @@ func TestParseTestArgs_AllowNoPropertiesReachesThePipeline(t *testing.T) {
 	}
 }
 
+// The exploration sweeps ask for a run the generator never drove, and they ask
+// for that alone. Riding on --allow-no-properties made one flag name two
+// unrelated waivers, so a sweep that wanted the property-free one silently lost
+// the dead-run detector as well.
+func TestParseTestArgs_AllowNoGeneratorActionsIsItsOwnFlag(t *testing.T) {
+	base := []string{"--spec", "s.ts", "--bundle-id", "com.example"}
+
+	options, err := parseTestArgs(base, io.Discard)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if pipelineOptions(options).AllowNoGeneratorActions {
+		t.Error("allowNoGeneratorActions default: got true, want false")
+	}
+
+	options, err = parseTestArgs(append(base, "--allow-no-generator-actions"), io.Discard)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !pipelineOptions(options).AllowNoGeneratorActions {
+		t.Error("--allow-no-generator-actions never reached the pipeline options")
+	}
+
+	options, err = parseTestArgs(append(base, "--allow-no-properties"), io.Discard)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if pipelineOptions(options).AllowNoGeneratorActions {
+		t.Error("--allow-no-properties still waives the dead-run refusal it does not name")
+	}
+}
+
 // TestExitCode_SeparatesFoundBugsFromBrokenHarnesses pins the three statuses CI
 // reads: 0 clean, 2 the run found violations, 1 everything else. A workflow
 // that asserts "the known bug is still found" is only meaningful while 2 and 1

cmd/sanderling/test_run.go

@@ -18,6 +18,7 @@ func pipelineOptions(options testOptions) testrun.Options {
 	return testrun.Options{
 		Spec:                    options.spec,
 		AllowNoProperties:       options.allowNoProperties,
+		AllowNoGeneratorActions: options.allowNoGeneratorActions,
 		BundleID:                options.bundleID,
 		Platform:                options.platform,
 		AVD:                     options.avd,