feat: add ask.switch

[pi0x]

Adds ask.switch, a companion to ask.if. It takes the same options as ask.choice but resolves straight to the selected label, so you can branch on it directly:

switch (await ask.switch`What kind of issue is ${issue}?`(["bug", "feature", "question"])) {
  case "bug":
    return label(issue, "bug");
  case "feature":
    return triage(issue);
}

Works inside ask(...) and on its own, with tags or plain calls. The request sent is the same as ask.choice; only the answer shape differs. Use ask.choice when you still need confidence or probabilities.

Both ask.choice and ask.switch now also accept an array of labels when no descriptions are needed. ["bug", "other"] is sent as { bug: null, other: null } and the answer keeps the "bug" | "other" type.

Also exported as askSwitch, since switch is a reserved word.

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