fix(gateway): Enable Gateway plugin build for 2026.1

[afida23]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Description

Gateway 2026.1's product-info.json contains moduleV2/productModuleV2 layout entries
without a classPath field. The intellij-plugin-structure library declares
ProductModuleV2.classPath as a non-null Kotlin parameter, so Jackson throws a
NullPointerException during deserialization, failing the build with "IDE is invalid".

This bug exists on the upstream master branch of
intellij-plugin-verifier
(ProductInfo.kt — ModuleV2 was fixed with a @JsonCreator factory, but
ProductModuleV2 was not), so no version of the library can be upgraded to as a fix.

Fix:

• Added ProductInfoPatcher in buildSrc that patches cached product-info.json files,
  adding empty classPath: [] to layout entries missing it.
• In toolkit-intellij-subplugin.gradle.kts, force-resolve the Gateway IDE dependency in
  afterEvaluate and run the patcher before bundledPlugins reads product-info.json.
  This makes the build work on first run with a clean Gradle cache.
• Added xi:fallback to the module-core.xml xi:include in plugin-gateway.xml.
• Removed 2026.1 from the Gateway skip list in settings.gradle.kts.

Tested this change and conformed that JetBrains Gateway 2026.1 is compatible for the CodeCatalyst provider.

Checklist

• My code follows the code style of this project
• I have added tests to cover my changes
• A short description of the change has been added to the CHANGELOG if the change is customer-facing in the IDE.
• I have added metrics for my changes (if required)

License

I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

Qodana for JVM

It seems all right 👌

No new problems were found according to the checks applied

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[yuriivv]

Awesome!