0.2.4 - Bridge callback fixes, post-build pod install, CI workflows

[ianrumac]

Fixes

• Fix configure result emitting an unknown error on success
• iOS _SuperwallBridge_ShowAlert ABI mismatch (3 pointers vs C# (string)) — now takes a single alertJson string matching the C# extern. iOS additionally fires the onCloseCallbackId immediately so the pending C# callback is cleaned up.
• Android showAlert was reading actionCallbackId / closeCallbackId, but C# emits onActionCallbackId / onCloseCallbackId — alert callbacks never fired. Fixed.
• iOS bridge: removed access to internal Superwall.shared.options — SetLocalResources now stashes the resource map and applies it via SuperwallOptions.localResources during Configure (must be called before Configure on iOS; logs a warning otherwise).
• Post-build pod install now locates pod across common install paths (/usr/local/bin, /opt/homebrew/bin, rbenv/asdf shims, which pod under a login shell) and runs under a login shell so user PATH from ~/.zshrc/~/.bash_profile is honored. Clear manual-install instructions on failure.
• Post-build pod install now sets LANG=en_US.UTF-8 and LC_ALL=en_US.UTF-8 in the subprocess so CocoaPods no longer crashes with Encoding::CompatibilityError when Unity is launched from Finder (inherits launchd's empty LANG).

Tests

• Added Tests/Runtime/BridgeContractTests.cs covering the async-response contract, Configure success/failure paths, and the delegate/handler payload shapes for the regressions fixed in this release.

CI

• Added .github/workflows/native.yml — builds the iOS Swift bridge via SPM on macOS and the Android .androidlib via Gradle on Ubuntu, on every push and PR. No Unity license required.
• Added parked .github/workflows/unity.yml for full game-ci Unity build + test runs, documented with the licensing secrets and wrapping-project steps needed to enable it.
• CI harness scaffolding lives under ci~/ (tilde-suffixed so Unity ignores it during package import — never copied into player builds).

Compatibility

• Minimum Unity version lowered from 6000.4 to 6000.3.