Add tuple overloads for Choice and System One questions

[kblok]

Yes — for the call sites. Nested Dictionary<string, object?> / Dictionary<string, Question> initializers were the noisy part compared to Question.Score’s params form. Tuples belong at those construction sites, not as the stored model: Choice criteria and answers are maps on the wire, and GetChoice("name") still needs named lookup.

What changed

Convenience overloads convert labeled pairs into dictionaries (duplicate keys throw TypeSafeException):

var response = await client.SystemOneAsync(
    new { document = "I was charged twice. Please fix this ASAP." },
    ("category", Question.Choice("What is this ticket about?",
        ("billing", null),
        ("technical", null),
        ("other", null))));

• Question.Choice(instructions, params (string Label, object? Description)[])
• client.SystemOneAsync(state, params (string Name, Question Question)[]) (and WithResponse)
• Question.Map(...) when you still need a dictionary (model, options, CancellationToken, or SystemOneRequest.Questions)

Existing dictionary overloads are unchanged. ChoiceQuestion.Criteria remains IReadOnlyDictionary<string, object?>.

Noul criteria stay a small type (NoulCriteria.Yes / .No omit a side on the wire); a 2-tuple would lose that. JSON DTOs are also unchanged.

Version

MinVerMinimumMajorMinor is now 0.2, so untagged packs are 0.2.0-preview.*. After merge, tag v0.2.0 on main to publish the stable package (per CONTRIBUTING).