test(cli): cover VortexCli.printUsage

main() dispatches then calls System.exit (covered end-to-end by CliIT); pin the
pure printUsage helper so the usage text keeps advertising every subcommand the
dispatch switch handles.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: dfa1

cli/src/test/java/io/github/dfa1/vortex/cli/VortexCliTest.java

@@ -0,0 +1,39 @@
+package io.github.dfa1.vortex.cli;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/// `main` dispatches and calls `System.exit`, so it is covered end-to-end by the CLI
+/// integration test rather than here. This pins the one pure, unit-testable piece — the
+/// usage text must advertise every subcommand `main` actually dispatches.
+class VortexCliTest {
+
+    @Test
+    void printUsage_listsEverySubcommand() {
+        // Given
+        ByteArrayOutputStream buf = new ByteArrayOutputStream();
+
+        // When
+        VortexCli.printUsage(new PrintStream(buf, true, StandardCharsets.UTF_8));
+
+        // Then — one line per subcommand handled by main()'s switch
+        String usage = buf.toString(StandardCharsets.UTF_8);
+        assertThat(usage)
+                .contains("Usage:")
+                .contains("inspect")
+                .contains("tui")
+                .contains("view")
+                .contains("export")
+                .contains("import")
+                .contains("schema")
+                .contains("count")
+                .contains("select")
+                .contains("stats")
+                .contains("filter");
+    }
+}