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Kabir Oberai 317e018f2b sdk: integrate OpenAppleMacros (#101)
## What does this PR do?

Adds support for proprietary Apple macros (like SwiftUI's `@Entry` and
`@State`) via
[OpenAppleMacros](https://github.com/xtool-org/OpenAppleMacros).

We have to re-implement these because the macros need to run on the
_host_, and the Apple SDKs include them as macOS-only dylibs.

## How was it tested?

- [x] Extensive integration tests in OpenAppleMacros that compare
Apple's expansions against ours
- [x] Confirmed that `@Entry`, `#Preview`, and `@State` work in Swift
6.3 and 6.4 (State is a PW in the former, macro in the latter)
- [x] Confirmed that OSS toolchain macros continue to work (tested
`@Observable`, `#bundle`)

## AI tool usage

How much of this PR was AI-assisted? (check one)

- [x] **0** - No AI was used to write code
- [ ] **1** - I was assisted by AI. I reviewed the finished result.
- [ ] **2** - I set the AI going and left it to it; nobody has read the
result - no review, or AI review only

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2026-09-19 04:28:51 -04:00
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