feat(#31): add dataset rm to home screen + in-run guidance

internal/cli/dataset_rm.go

@@ -97,6 +97,9 @@ Exit codes:
 func runDatasetRm(ctx context.Context, a runDatasetRmArgs) error {
 	p := a.Printer
 	p.Banner("tracebloc", "delete a pushed dataset")
+	p.Para(`This permanently removes a dataset you pushed earlier: it drops the table from
+the cluster and deletes the dataset's files on the shared storage. It can't be
+undone — re-pushing the data is the only way back.`)
 
 	// 1. Validate the name before we build any PVC path from it
 	//    (push.PlanTeardown panics on an unsafe name by design).
@@ -160,6 +163,7 @@ func runDatasetRm(ctx context.Context, a runDatasetRmArgs) error {
 			return &exitError{code: 3, err: errors.New(
 				"refusing to delete without confirmation: pass --yes or run on a terminal")}
 		}
+		p.PromptHint("This drops the table and removes the files listed above — there's no undo. Pass --yes next time to skip this prompt.")
 		ok, err := a.Prompter.Confirm(fmt.Sprintf("Delete %q and its files?", a.Table), false)
 		if err != nil {
 			if errors.Is(err, errInteractiveCancelled) {

internal/cli/root.go

@@ -93,6 +93,7 @@ what's planned next.`,
 		p.Banner("tracebloc", "declarative data ingestion for your cluster")
 		p.Section("Get started")
 		p.Infof("tracebloc dataset push ./data     — stage + ingest a dataset (guided if you omit flags)")
+		p.Infof("tracebloc dataset rm <table>      — delete a pushed dataset (its table + files)")
 		p.Infof("tracebloc cluster info            — check the CLI can reach your cluster")
 		p.Infof("tracebloc ingest validate f.yaml  — validate an ingest.yaml locally")
 		p.Hintf("Add --help to any command for the full flag list.")

internal/cli/root_test.go

@@ -41,7 +41,7 @@ func TestRootCmd_HomeScreen(t *testing.T) {
 	if err := root.Execute(); err != nil {
 		t.Fatalf("bare root failed: %v\n%s", err, out.String())
 	}
-	for _, want := range []string{"tracebloc", "dataset push", "cluster info"} {
+	for _, want := range []string{"tracebloc", "dataset push", "dataset rm", "cluster info"} {
 		if !strings.Contains(out.String(), want) {
 			t.Errorf("home screen missing %q:\n%s", want, out.String())
 		}