fix(action): restore Core runtime compatibility

[ivanmilevtues]

Summary

• select Temurin 21 inside the composite action so JDTLS can analyze Java repositories
• import relation projection from its packaged CodeBoarding 0.13.10 module
• align renderer mocks with the installed package layout
• smoke-test the pinned Core release by rendering the checked-in analysis in CI

Verification

• python3 -m unittest discover -s tests -v — 94 passed
• pre-commit run --all-files — Black passed
• Spring PetClinic run confirmed Java 21 starts JDTLS; the stale renderer import was the remaining failure

This is a fix: change so release-please will propose a patch release.

[codeboarding-review]

CodeBoarding review · analyzing…

⏳ CodeBoarding is analyzing this pull request's architecture changes.

_{run 33022252699 · attempt 1}

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve existing Maven settings when selecting the JDK

When a workflow configures ~/.m2/settings.xml for private dependencies before invoking this composite action, actions/setup-java defaults overwrite-settings to true and replaces that file with its generated GitHub Packages configuration. This can make CodeBoarding's Java dependency resolution incomplete and also breaks later Maven steps in the caller's job; set overwrite-settings: false because this step only needs to select the JDK.

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[chatgpt-codex-connector]

Retain support for runners that cannot execute Node 24 actions

actions/setup-java@v5 moved its runtime to Node 24 and requires Actions Runner v2.327.1 or newer, so otherwise-valid self-hosted and GitHub Enterprise Server jobs on older runners now fail at this step before CodeBoarding starts, including reviews of non-Java repositories. setup-java@v4 can install Temurin 21 without imposing this new runner requirement, so use that major unless dropping older runners is intentional and documented.

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