Address Gradle 9.6 deprecations

[alexander-yevsyukov]

What & why

Following the bump to Gradle 9.6.1, the build surfaced a number of deprecation
warnings (several "will fail in Gradle 10"). This branch clears every
deprecation that originates in config's own sources and retires a pair of
already-deprecated JaCoCo script plugins.

Changes

Retire the vanilla-JaCoCo script plugins (6ee1ede8)

• Deleted buildSrc/src/main/kotlin/jacoco-kotlin-jvm.gradle.kts and
  jacoco-kmm-jvm.gradle.kts (superseded by Kover via the jvm-module /
  kmp-module conventions).
• Taught migrate to remove them from consumers on the next pull, mirroring the
  existing ProtoData/McJava retirement block (cleans up stale copies; no
  copy-then-delete since they're gone from config).

Fix Gradle 9.6 / Kotlin-DSL deprecations in buildSrc (09eaf71b)

• ProjectMetadata.kt: drop the deprecated org.gradle.kotlin.dsl.PropertyDelegate
  interface — Kotlin delegation only needs an operator fun getValue, so the
  marker interface (and the provideDelegate import) are gone. Behaviour
  identical, including the extra[name] fallback.
• jvm-module.gradle.kts, write-manifest.gradle.kts: val x by registering { }
  → val x = register<Type>(name) { } (returns the same lazy TaskProvider).
• kmp-module.gradle.kts, uber-jar-module.gradle.kts: val x by getting { }
  → getByName(name) { } (eager equivalent, matching the old delegate
  semantics; unused vals and their @Suppress("unused") dropped).

Track the remaining (upstream) deprecations (de52cc57)

• Added .agents/tasks/gradle-9.6-deprecations.md (status: blocked).

Remaining deprecations are upstream — not fixable here

Two configuration-time warnings remain, and both come from third-party plugins'
apply() code, not from config:

Deprecation	Source	Version
ReportingExtension.file(String)	io.gitlab.arturbosch.detekt.DetektPlugin.apply	detekt 1.23.8
Project.getProperties	com.osacky.doctor → RemoteCacheEstimation.<init>	gradle-doctor 0.12.1

Both plugins are already at their latest published release, and neither latest
release fixes the call — so there is nothing to upgrade to yet. They are
non-fatal on 9.6. The task note records the evidence and the bump trigger for
when upstream ships Gradle-9.x-compatible releases. Global warning suppression
was deliberately avoided (it would mask config's own future deprecations).

Verification

./gradlew :buildSrc:build detekt --rerun-tasks   # BUILD SUCCESSFUL, zero `w:` warnings
./gradlew help --warning-mode all --stacktrace   # only the two upstream warnings remain

🤖 Generated with Claude Code

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[Copilot]

Pull request overview

This pull request updates config’s Gradle/Kotlin-DSL sources to eliminate deprecation warnings introduced by the Gradle 9.6.1 upgrade (especially those noted as “will fail in Gradle 10”), and removes legacy JaCoCo script plugins that are now superseded by the Kover-based module conventions.

Changes:

• Retired the legacy “vanilla JaCoCo” script plugins and taught migrate to delete stale copies from consumer repos.
• Replaced deprecated Kotlin-DSL delegated task/source-set access patterns (registering / getting) with non-deprecated equivalents.
• Added a tracked task note documenting the remaining upstream plugin deprecations and when to revisit upgrades.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
migrate	Removes stale consumer copies of retired JaCoCo script plugins during JVM repo migration.
buildSrc/src/main/kotlin/write-manifest.gradle.kts	Replaces deprecated delegated task registration with explicit tasks.register(...).
buildSrc/src/main/kotlin/uber-jar-module.gradle.kts	Replaces deprecated delegated task lookup with tasks.getByName(...) configuration.
buildSrc/src/main/kotlin/kmp-module.gradle.kts	Replaces deprecated delegated source set access with getByName(...) configuration.
buildSrc/src/main/kotlin/jvm-module.gradle.kts	Replaces deprecated delegated task registration with register<Delete>(...).
buildSrc/src/main/kotlin/jacoco-kotlin-jvm.gradle.kts	Deleted (retired legacy JaCoCo script plugin).
buildSrc/src/main/kotlin/jacoco-kmm-jvm.gradle.kts	Deleted (retired legacy JaCoCo script plugin).
buildSrc/src/main/kotlin/io/spine/gradle/report/pom/ProjectMetadata.kt	Removes deprecated PropertyDelegate marker usage while preserving delegation behavior via operator getValue.
.agents/tasks/gradle-9.6-deprecations.md	Adds a tracker note for remaining upstream-only deprecations and upgrade triggers.