test(cli): cover engine-selection in the help telemetry table

The `cli_help` capture path in `help.ts` is generic over the topic
string, so this was never a functional gap -- just a table that listed
every routing topic except the one this change adds.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jwc9FFroR3mTZ4hLiSkkX3

Author: theCodeDrift

packages/cli/test/help-routing-telemetry.test.ts

@@ -37,7 +37,7 @@ describe("help routing topics emit cli_help intent telemetry", () => {
     logSpy.mockRestore();
   });
 
-  it.each(["route", "existing", "static", "remote"])(
+  it.each(["route", "existing", "static", "remote", "engine-selection"])(
     "captures cli_help for %s",
     async (topic) => {
       const command = createHelpCommand({}) as unknown as RunnableCommand;