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build: upgrade judge toolchains to Python 3.14, Java 25 and Kotlin 2.4 - #25
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Runner: Python 3.14.10, Temurin JDK 25.0.5, Kotlin 2.4.21 (checksum matches JetBrains' published .sha256). The app, CI and local tooling move to Python 3.14 too, so there is one Python line; ruff now targets py314.
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Moves the judge onto current releases. Python 3.14 and Java 25 are also what most interview platforms now judge with, so solutions behave the same here as in a real interview.
Changes
.sha256)make setuppy314. Its formatter switches multi-exception handlers to 3.14's unparenthesisedexcept A, B:form (PEP 758), applied in 3 files.Verification
make test-runner: 61 passed on the new toolchains. The only warning is Python 3.14 deprecatingfork()in a multi-threaded process, inside one test, not in the runner./api/status: Python 3.14.10, OpenJDK 25.0.5, Clang 19.1.7, kotlinc 2.4.21.make validate-content(3 problems, 0 errors) andmake smoke(Java, C++ and Kotlin references accepted 71/71; wrong answers detected).sample_refs -n 80(seed 7) on a scratch instance, run on both this branch andmain's toolchain. The verdicts are identical: Python 79/79, Java 74/79, C++ 76/78, Kotlin 2/2. The same 7 failures appear on both and come from upstream test cases that break their problems' constraints.