[TrapsterDK]

Part of #9069

What changed

• kotlin_test (kotlin/private/defs.bzl, kwargs.bzl) sets the upstream kt_jvm_test main_class to the test class under the new //kotlin/private:windows_coverage config_setting (Windows target + --collect_code_coverage), else BazelTestRunner. The rules_kotlin 2.4.21 Windows launcher appends -Dbazel.test_suite=<main_class>, which now names the test class; JACOCO_MAIN_CLASS from dx_jvm_test_coverage still starts BazelTestRunner. This lives in rules_dx code, so consumers get it with no setup.
• Removed the root-only patches/rules_kotlin/windows_coverage_test_suite.patch, its single_version_override in MODULE.bazel and the patches/README.md row. MODULE.bazel.lock regenerated with Bazel.

Tests

• Local (linux_x86_64): bazel test //kotlin/private:all //kotlin/tests/... pass; bazel coverage //kotlin/tests/fixtures/hello:hello_test //kotlin/tests/fixtures/hello:InferredTest pass.
• Windows evidence //tools/testing/hermetic:cpp_rust (windows_x86_64, combined with gazelle/julia: use upstream julia rules, no patched attr for consumers (part of #11418) #12641 and hermetic: no_refetch ignores local_path_override modules and local = True repository rules (part of #11443) #12703 on branch fix-11418-julia-package-name): not yet green. Runs 43651406826 and 43653857809 failed in the refetch check (hermetic: no_refetch ignores local_path_override modules and local = True repository rules (part of #11443) #12703's scope: run 43653857809 refetch_rules_0 exited 2 in the rules_rust crate_universe extension), before the Kotlin coverage probe ran. Kotlin Windows coverage is not yet shown by CI.
• Nested-Bazel and consumer tests were not run locally (CI runs them).

Remaining for #9069

• Windows evidence for Kotlin coverage (cpp_rust coverage probe) once the hermetic: no_refetch ignores local_path_override modules and local = True repository rules (part of #11443) #12703 refetch check passes.
• When a rules_kotlin release includes Route command failures through one shared JSON error boundary #1829: bump rules_kotlin and drop the windows_coverage select.
• When bazel#32479 ships and is pinned: drop the JACOCO_MAIN_CLASS hook (and the select, since the launcher would then start the test class) and point jvm_coverage_env_test at upstream.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xut2hvuiHK9vSNJZWiqKfX

[TrapsterDK]

Run 43650776233 failed on the julia package_name analysis error (main bug, fixed by #12641), not on Kotlin. #12641 is now stacked on this branch; run 43651406826 covers both.

[TrapsterDK]

Run 43651406826 (Windows cpp_rust): every probe passed, including fetch_coverage. The run failed only at the no_refetch check: "a restarted server refetched repositories" (local_config_winsdk, host_platform, local_jdk, ...). #12703 fixes that check. I stacked #12703's 3 commits, plus a unit-test fix that writes the rules_julia patches in the_consumer_materializes_from_dx_init (that test also fails on main), onto fix-11418-julia-package-name. Then I dispatched run 43653857809. The coverage probe, which covers Kotlin, runs after no_refetch, so it is still unverified.