ci: add Swift example project compilation to CI pipeline

[chipp]

TL;DR

Upgrades CI to target macOS 26 / Xcode 26, adds a Swift sample app build step, and removes third-party Swift package dependencies.

What changed?

• CI matrix updated from macOS 15 / Xcode 16.x to macOS 26 with Xcode versions 26.0.1, 26.1.1, 26.2, and 26.3, each paired with a corresponding iOS SDK. Two additional entries (26.4 and 26.5-beta) are commented out for future use.
• The DEVELOPER_DIR environment variable is now set dynamically in a dedicated step to handle version strings containing hyphens (e.g. 26.5-beta → 26.5_beta).
• Swift tests now pipe through xcbeautify for cleaner output.
• A new step checks whether iOS simulator destinations are available before building the sample app, downloading the iOS platform if needed.
• A new build step compiles the IDKitSampleApp Xcode project against the matrix-specified iOS SDK without code signing.
• BigInt, CryptoSwift, and swift-crypto have been removed as Swift package dependencies from Package.swift, and Package.resolved has been deleted entirely.

How to test?

Push a branch and observe the CI workflow running against the updated macOS 26 matrix. Verify that the Swift tests pass, the sample app builds successfully for each SDK variant, and no dependency resolution errors occur due to the removed packages.

Why make this change?

The CI environment needed to be brought up to date with the latest Apple toolchain releases. Removing the third-party cryptography and big-integer dependencies reduces the package's external surface area, likely because that functionality is now handled internally (e.g. via the idkitFFI binary target or native framework APIs available in the newer SDKs).

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Project	Deployment	Actions	Updated (UTC)
idkit-js-example	Ready	Preview, Comment	Apr 21, 2026 5:59am

[chipp]

• ci: add Swift example project compilation to CI pipeline #216 : 2 dependent PRs (#213 , #217 ) 👈 (View in Graphite)
• fix(ci): add rust-toolchain.toml with locked Rust version, use it across all github workflows #215
• main

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[Takaros999]

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Target iOS Simulator in simulator build step

The simulator build command uses -sdk iphonesimulator but still sets -destination "generic/platform=iOS", which is the device platform. xcodebuild treats iOS and iOS Simulator as separate destination platforms, so this mismatch can cause destination resolution errors and fail the swift-bindings job on every run that reaches this step. The destination here should be the simulator platform.

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