[benjamin202410]

Summary

The `C-[n-o] tests` matrix job is the slowest CI job (~8 min vs ~2–4 min for the others). `build/ci.go test` runs packages sequentially (`-p 1`), and `consensus/tests/engine_v2_tests` alone accounts for ~235s of it.

This moves `engine_v2_tests` into its own `Engine v2 tests` matrix entry and excludes it from `C-[n-o] tests`, so the two run in parallel. No package is dropped or duplicated.

Test plan

• Checked that the new `C-[n-o]` package list no longer contains `engine_v2_tests`
• CI: both jobs pass, and the longest test job is shorter

🤖 Generated with Claude Code

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[gzliudan]

A better solution to address the root cause:

• ci: run the whole suite under the race detector, 450s → 123s #2912
• test(consensus,core): cut engine v2 test wall time from 219s to 67s #2944