benchmarks: a host without ps is not read as quiet; run_all.sh records the busy count as unknown and labels the figures quiet-unverified - #387

…s the busy count as unknown and labels the figures quiet-unverified

The benchmark test file runs the real run_all.sh against stand-ins, and run_all.sh's quiet_gate called `ps -axo comm=,args=` unconditionally. On a host without ps (the lab's CLOUD task image) the script exited 127 at that line and test_benchmark_harness failed there: test_absent_pynecore_harness_completes_without_pynecore_outputs and test_absent_harness_without_committed_indicator_output_skips_three_way_report ("AssertionError: 127 != 0 ... ps: command not found").

quiet_gate now checks `command -v ps`. With ps, nothing changes: the same count, the same log line, the same tsv columns, the same report. Without ps the busy count is UNKNOWN, never 0: the timing-batch log line says "busy count unknown (ps absent)", the busy column of _workdir/speed_loads.tsv holds "unknown (ps absent)", and every figure of that run is labelled in the generated report (the line "quiet-unverified: no ps on this host, the busy count was not measured; do not use these figures as performance evidence" is appended to _workdir/speed.md and printed again as the last line of the run). With QUIET_LOAD_MAX set the wait loop decides on load alone and still ends by QUIET_WAIT_S; the label still applies. When PyneCore timings exist and the notice is set, aggregate.py writes to _workdir/speed.md instead of the committed benchmarks/results/speed.md, so unverified figures never replace the committed table. The header comment of run_all.sh says what happens without ps.

Tests (benchmarks/tests/test_run_all.py): the report cases now stub sysctl and ps so they no longer depend on the host's ps; three new cases: test_quiet_gate_without_ps_labels_figures and test_quiet_gate_without_ps_uses_load_only run run_all.sh with a PATH of symlinks that has no ps (exit 0, the log line, the tsv column, the label in speed.md and as the last output line, the committed speed.md byte-unchanged, with and without the PyneCore harness); test_quiet_gate_with_ps_preserves_verified_output runs with a ps stand-in and asserts the old output exactly and that none of the new text appears. Red first: the three new cases against the base run_all.sh fail with exit 127 and "ps: command not found" (4 subtest failures in the two missing-ps cases; the with-ps case passes on the base, as it should); on this tree the whole file passes (11 tests).

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>