fix(swift): generate valid inline union contract values

[calvin-archastro]

Review on ArchCode

Problem

Regenerate SDK in archastro-swift (#6) fails Build + Test (macOS) → REST contract tests: 17 failures, all HTTP 422 from Prism.

spec: ExternalObjectCreateInput.object = oneOf by `type` (r2_bucket requires type + name)
generator: swiftTypedValue(union) → "[:]"
test:     externalObjects.create(input: .init(object: [:], service: "cloudflare"))
Prism:    request fails schema validation → 422
test:     expects 2xx / 401 / 403 / … → fails

Affected: ExternalObjectsContractTests create/update (12) and AiContractTests ai_evaluation_evaluations (5, questions: [[:]]). These tests are new with this spec refresh; Swift main last regenerated in August.

Go hit the same bug and was fixed in dc7b4b3; Swift never got the matching change.

What changed

• swift-values.ts: case "union" → generateDummyValue(typeRef, fieldName, "swift"), which fills in the first variant's required fields. Same as Go's go-values.ts. unknown still renders [:].
• Safe to compile: Swift maps every inline union to JSONValue, which accepts dictionary, array, string, number, and boolean literals.

Before → after (generated Swift test):

object: [:]                                   → object: ["name": "test-name", "type": "r2_bucket"]
questions: [[:]]                              → questions: [["id": "test-id", "instructions": "test-value", "type": "boolean"]]

Scope / risk

Generator only (Swift contract-test fixtures). No SDK runtime or model output changes. Low risk.

Testing

• New swift.test.ts › populates inline union JSONValue inputs with a valid variant: failed before the fix (Received: "[:]"), passes after.
• npm test (sdk-generator): 425/425. tsc --noEmit and npm run lint clean.
• End-to-end: built this generator, ran ARCHASTRO_SDK_GENERATOR_BIN=… ./scripts/regenerate_sdk.sh --local <this checkout> in archastro-swift on the auto/regenerate-sdk head, then ran the CI steps locally on macOS:
  • prism mock specs/platform-openapi.json + swift test --skip-build --filter 'ArchAstroPlatformContractTests[.]' → 1559 tests in 64 suites passed (previously 17 failures).
  • ARCHASTRO_RUN_CHANNEL_CONTRACT_TESTS=1 swift test --filter 'ChannelContractTests|StreamContractTests|HarnessLifecycle' → 81 tests in 9 suites passed. ApiChatChannelContractTests output also changes with this fix and passes.
• Automatic coverage: this repo's CI runs the new vitest case on every PR. archastro-swift CI (Build + Test (macOS)) runs the generated contract tests on each regen PR.

Follow-up

Release sdk-generator v0.11.10 (Release workflow, patch), then rerun Regenerate SDK in archastro-swift.

🤖 Generated with Claude Code