## What does this PR do?
Adds integration tests
## How was it tested?
CI
## 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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open as a draft if it is #2. Do not lower the declared level to get the
PR reviewed. -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Tests**
* Added integration smoke tests covering version checks, app creation,
iOS build metadata, and slim SDK update behavior.
* Added validation for locating Xcode and verifying the Swift toolchain.
* **Chores**
* Added automated integration-test execution for pushes and pull
requests.
* Added Docker and Compose support for running integration tests in a
consistent environment.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Kabir Oberai