fix(ci): cap coverage job timeout and decouple from PR gate#22
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… vector with serial_test + tokio under instrumentation
…le lock contention under llvm-cov
…hain access hangs in headless runner
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PR #20 burned 6h on a hung instrumented coverage step; PR #21 hung 58 min on the same pattern. Three mitigations:
timeout-minutes: 30at job level +timeout-minutes: 20on the LCOV step. Hangs fail in 20-30 min instead of 6h.RUST_TEST_THREADS: 1to serialize under instrumentation. Likely cause of the hang is wiremock + serial_test + tokio + llvm-cov parallelism deadlock.continue-on-error: trueso coverage flakes do not block PRs from merging while we investigate the root cause separately.Coverage stays informational. Quality gates (clippy, tests, build, audit) still block merges.