Address Gradle 9.6 API deprecations

[alexander-yevsyukov]

What changed

CI was emitting ~25 deprecation warnings from the Gradle 9.6 upgrade. This clears all of them.

1. Kotlin DSL property delegates → configuration-avoidance APIs

Gradle 9.6 deprecated the by tasks.registering / by tasks.getting / by extra delegate
sugar. getting in particular is eager — it realizes the task at configuration time.

File	Before	After
buildSrc/…/module.gradle.kts:259	by tasks.registering	tasks.register("prepareProtocConfigVersions")
buildSrc/…/version-to-resources.gradle.kts:47	by tasks.registering	tasks.register("createVersionFile")
gradle-plugin/build.gradle.kts:62	by getting(JvmTestSuite::class)	named<JvmTestSuite>("test")
gradle-plugin/build.gradle.kts:78	val test: Task by tasks.getting	tasks.named("test")
gradle-plugin/build.gradle.kts:90	by tasks.getting(ShadowJar::class)	tasks.named<ShadowJar>("shadowJar")
gradle-plugin/build.gradle.kts:198	val versionToPublish: String by extra	extra["versionToPublish"] as String

The deprecation text suggests getByName<Type>(name), but a companion warning in the same
group says "Use the named() API instead". named is the right target — getByName is eager
and would work against Gradle's configuration-avoidance direction.

The publishPlugins / publish / ideaModule configuration was collapsed into the single
existing tasks { } block, because publishPlugins had been configured twice: once via the
deprecated delegate for enabled, once via the accessor for notCompatibleWithConfigurationCache.

2. Dropped the idea plugin

GenerateIdeaModule and IdeaPlugin are both @Deprecated in Gradle 9.7 and scheduled for
removal in Gradle 10. In this repo the plugin was applied but never configured, and every
.iml file on disk lives under .idea/modules/ — IntelliJ's own Gradle-import layout, not the
module-root location the Gradle plugin writes to. None are tracked in git, so no committed IDE
metadata depended on its output.

Removed from the root build.gradle.kts and from buildSrc/…/module.gradle.kts. The
now-dangling named("ideaModule") { … } block in gradle-plugin/build.gradle.kts had to go
with it — named() throws on a missing task — which also retires the configuration-cache
workaround for gradle#13480.

idea also appears in buildSrc/…/uber-jar-module.gradle.kts and
buildSrc/…/javascript/plugin/Idea.kt, but both are byte-identical copies distributed by the
config submodule and neither is reachable from this build. They belong in a config PR.

Notes for the reviewer

• Verified no regression in configuration-cache behaviour. Stashed and re-ran
  --configuration-cache on the base: both sides report the same 5 pre-existing problems,
  including the createVersionFile one, so the tasks.register conversion introduced nothing.
• ./gradlew build passes; :api:test, :protoc-plugin:test and :gradle-plugin:test all run.
• gradlew tasks --all no longer lists any idea / cleanIdea task.
• Dependency reports regenerated for 0.17.2 in a separate commit.
• named("publish") at gradle-plugin/build.gradle.kts:213 was switched to the type-safe
  publish { } accessor, matching publishPlugins { } in the same block.

🤖 Generated with Claude Code

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-01T14:36:51.295481Z	7b1ffff	PR opened

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 14.40%. Comparing base (ae7be0c) to head (477bb90).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #22   +/-   ##
=========================================
  Coverage     14.40%   14.40%           
  Complexity        9        9           
=========================================
  Files             5        5           
  Lines           118      118           
  Branches          6        6           
=========================================
  Hits             17       17           
  Misses          101      101           

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