remove legacy-bridge

[kiftio]

What changes are you making?

Removes the legacy CheckoutBridge JS interface (registered under the "android" name) and replaces it entirely with EmbeddedCheckoutProtocol as the sole JavaScript interface attached to CheckoutWebView. As part of this:

• CheckoutBridge.kt and its associated WebToSdkEvent model are deleted.
• The errorevents subpackage (CheckoutErrorDecoder, CheckoutErrorGroup, CheckoutErrorPayload) is removed, along with the error-group-based exception mapping it performed.
• The lifecycleevents subpackage models (Address, CartInfo, CartLine, CartLineImage, CheckoutCompletedEvent, CheckoutCompletedEventDecoder, CompletedEvent, DeliveryDetails, DeliveryInfo, Discount, MoneyV2, OrderDetails, PaymentMethod, Price) are removed from the public API surface, as they are now generated from the protocol definition.
• ConfigurationException and ClientException are removed from the documented exception hierarchy and error table. CheckoutExpiredException error codes cart_completed and invalid_cart are also removed.
• CheckoutWebViewListener no longer holds a toggleHeader callback, and CheckoutDialog no longer wires up header visibility toggling in response to modal events.
• CheckoutWebView now holds the listener directly rather than delegating through CheckoutBridge.
• All tests covering CheckoutBridge, CheckoutCompletedEventDecoder, CheckoutErrorDecoder, and the corresponding Java interop cases are removed.
• AGENTS.md is updated to reflect the new architecture, replacing references to CheckoutBridge and its SCHEMA_VERSION contract with EmbeddedCheckoutProtocol.

How to test

1. Build the library and confirm it compiles cleanly with no references to CheckoutBridge or the removed errorevents/lifecycleevents classes.
2. Run the existing test suite (./gradlew :lib:test) and confirm all remaining tests pass.
3. Run CheckoutWebViewTest and verify the JavaScript interface assertions now reference EmbeddedCheckoutProtocol.INTERFACE_NAME.
4. Open a checkout flow in the MobileBuyIntegration sample app and verify that checkout loads, completes, and surfaces errors correctly through EmbeddedCheckoutProtocol.
5. Verify the Java interop test (InteropTest.java) compiles and passes without the removed decoder tests.

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Before you merge

Important

• I've added tests to support my implementation
• I have read and agree with the Contribution Guidelines
• I have read and agree with the Code of Conduct
• I've updated the relevant platform README (platforms/swift/README.md and/or platforms/android/README.md)

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Releasing a new Swift version?

• I have bumped the version in ShopifyCheckoutKit.podspec
• I have bumped the version in platforms/swift/Sources/ShopifyCheckoutKit/ShopifyCheckoutKit.swift
• I have updated platforms/swift/CHANGELOG.md
• I have updated the SwiftPM/CocoaPods version snippets in platforms/swift/README.md (major version only)

Releasing a new Android version?

• I have bumped the versionName in platforms/android/lib/build.gradle
• I have updated platforms/android/CHANGELOG.md
• I have updated the Gradle/Maven version snippets in platforms/android/README.md

Tip

See the Contributing documentation for the full release process per platform.

[kiftio]

• remove legacy-bridge #190 👈 (View in Graphite)
• main

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