[sergej-koscejev]

Summary

Renovate PRs, as listed on the dependency dashboard (#68):

- 19 branches, one per dependency or version line
+ non-major dependencies        Gradle 8.x, Kotlin, BCV, foojay 0.x, Guava, commons-io, xmlunit, JUnit 5.x, artifact-transforms
+ Gradle (major)                Gradle 9 + foojay 1
+ test frameworks (major)       JUnit 6 + Mockito 5
+ GitHub Actions                all actions and the CI JDK, majors included
+ MPS                           compile version, non-major
+ MPS (major)                   compile version, major
+ MPS test versions             patches of supportedMpsVersion.<line> + any prerelease update

All groups run on the monthly schedule, except "MPS test versions", which runs at any time: prerelease builds are
deleted from the repository after a few weeks.

The supported MPS versions move to one property per release line, so Renovate can track each entry with a plain
regex manager. Its versioning uses a compatibility group, so each entry only gets patches of its own line:

-supportedMpsVersions=2023.2.2,2024.1.6,2025.1.4,2026.1.1
+supportedMpsVersion.2023.2=2023.2.2
+supportedMpsVersion.2024.1=2024.1.6
+supportedMpsVersion.2025.1=2025.1.4
+supportedMpsVersion.2026.1=2026.1.1
-mpsPrereleaseVersion=263.6259.45
+supportedMpsPrereleaseVersion=263.6259.45

Per-platform tasks and configurations are named by release line, and the prerelease platform is named Prerelease, so
the names stay the same across updates:

-testMps2025.1.4   testMigrateForMps2025.1.4   generate…WithMps2025.1.4
+testMps2025.1     testMigrateForMps2025.1     generate…WithMps2025.1
-testMps263.6259.45
+testMpsPrerelease

Gradle fails if a value is not from its release line, for example supportedMpsVersion.2025.1=2024.1.6.

MpsPlatform gets a name field. mpsVersion stays the full version, because it's passed to the launcher. The CI
matrix comes from the property keys. A new release line is one new property, for example
supportedMpsVersion.2026.2=2026.2.

The launcher's Mockito cap [4.11.0,5) ("does not support Java 8") is gone: the launcher builds with Java 17.

Evidence

• Renovate: renovate-config-validator --strict passes. Local renovate --platform=local --dry-run=lookup:

  Before: 19 branches on the dashboard; supportedMpsVersions not tracked.

  After: 7 PR branches, plus lock file maintenance, which has nothing to change. MPS test versions:

  Update MPS test versions
    com.jetbrains:mps 2023.2.2 -> 2023.2.3
    com.jetbrains.mps:mps-prerelease 263.6259.45 -> 263.6259.106
  

  With supportedMpsPrereleaseVersion set to an older major (262.9437.420, only for the test), the prerelease goes to
  263.6259.106 in the same PR. 2024.1, 2025.1 and 2026.1 get no updates: no newer patches, and no EAP or RC builds.

• Gradle: tasks --all lists testMps2023.2 … testMps2026.1 and testMpsPrerelease in integration-tests,
  migrate and remigrate. The configurations resolve com.jetbrains:mps:2023.2.2, 2026.1.1 and
  mps-prerelease:263.6259.45. :remigrate:testMps2026.1 and
  :integration-tests:executeTestExitCodeNoArgumentsWithMps2026.1 pass. testMpsPrerelease depends only on
  prerelease tasks.

• CI matrix: the new jq step gives ["2023.2","2024.1","2025.1","2026.1","Prerelease"].

Merge Danger

Blast Radius: CI

The CI job names and the per-version Gradle task names change, for example testMps2025.1.4 → testMps2025.1 and testMps263.6259.45 → testMpsPrerelease. If
branch protection names the matrix jobs instead of the build job, update it. Published artifacts don't change.