Mission Run Overview
Mission Run: Isolate the WP-prompt latency NFR tests from parallel execution (warm/median measurement)
Fix the flaky test_wp_prompt_build_latency.py NFR gate (#2032): the single cold wall-clock sample is corrupted by CPU contention on the parallel -n auto arch pole. Mark the 2 tests with the canonical @pytest.mark.timing marker, exclude them from the arch selectors (and not timing), and run them in a NEW always-on serial -m timing step (if: always(), -n0) — NOT the cli-gated restart-daemon-nfr-timing job (which would skip on src/runtime/next prompt-builder PRs). Keep the wall-clock oracle (build does subprocess+IO) + a warm sample. M4 of epic #1931.
Fix the flaky test_wp_prompt_build_latency.py NFR gate (#2032): the single cold wall-clock sample is corrupted by CPU contention on the parallel -n auto arch pole. Mark the 2 tests with the canonical @pytest.mark.timing marker, exclude them from the arch selectors (and not timing), and run them in a NEW always-on serial -m timing step (if: always(), -n0) — NOT the cli-gated restart-daemon-nfr-timing job (which would skip on src/runtime/next prompt-builder PRs). Keep the wall-clock oracle (build does subprocess+IO) + a warm sample. M4 of epic #1931.