ci: build validation

[pwltr]

Summary

• Add a PR validation workflow for Rust and shell checks
• Add an iOS workflow that builds and uploads the XCFramework artifact

Details

This adds two focused GitHub Actions workflows:

• validation.yml

  • checks shell script syntax
  • runs cargo check --locked
  • runs cargo test --locked
  • runs cargo clippy --locked --all-targets

• ios.yml

  • validates Package.swift
  • runs ./build_ios.sh
  • verifies the generated XCFramework and zip exist under dist/ios
  • uploads the generated iOS artifacts as workflow artifacts

The existing Gradle publish workflow is unchanged. Android build validation and release automation can be added as separate follow-up workflows.

Testing

Ran locally:

bash -n build.sh build_ios.sh build_android.sh
cargo check --locked
cargo test --locked
cargo clippy --locked --all-targets
swift package dump-package

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