[codex] add Private Cloud Compute support to Apple provider

[grabbou]

Summary

Adds the WWDC26 Apple Foundation Models surface that fits the current Apple provider without broad API churn:

• Adds apple('private-cloud-compute') / apple.languageModel('private-cloud-compute') while keeping system-default as the default model.
• Adds AI SDK v6-native providerOptions.apple.reasoningLevel with light, moderate, and deep validation.
• Threads model and reasoningLevel through the native generation options.
• Adds guarded Swift support for PrivateCloudComputeLanguageModel and iOS 27 ContextOptions; Xcode 26/iOS 26 SDK builds still compile and return UNSUPPORTED_OS for PCC-only paths.
• Maps Apple rate-limit/quota failures to public AppleLLMErrorCodes.RateLimited / RATE_LIMITED.
• Updates package, website, README, and skill docs for AI SDK v6, PCC requirements, reasoning, and context-window differences.

Why

Apple's WWDC26 Foundation Models updates added Private Cloud Compute access through the same LanguageModelSession API, plus iOS 27 ContextOptions reasoning levels. The provider previously always used SystemLanguageModel.default, so React Native users had no narrow way to opt into PCC from the Vercel AI SDK model surface.

I intentionally did not add image attachments, custom LanguageModel providers, dynamic profiles, or PCC quota introspection in this PR. Those need separate JS/native API design and would make this change much wider.

Validation

• bun run lint
• bun run typecheck
• bun run --filter='@react-native-ai/apple' prepare
• git diff --check
• Swift compiler guard probe with Xcode 26 / Swift 6.2 to verify iOS 27-only symbols compile out on the current SDK

prepare emits existing stale Browserslist/baseline data warnings, but exits successfully.

References

• https://developer.apple.com/documentation/FoundationModels
• https://developer.apple.com/videos/play/wwdc2026/241/
• https://developer.apple.com/documentation/foundationmodels/privatecloudcomputelanguagemodel
• https://developer.apple.com/documentation/foundationmodels/contextoptions
• https://ai-sdk.dev/docs/migration-guides/migration-guide-5-0

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Project	Deployment	Actions	Updated (UTC)
ai	Ready	Preview, Comment	Jun 11, 2026 7:42pm