Per Finding 3, a uniform τ_qa=7d filtered out every recent
CANONICAL_PROJECTION row (the π* graduations from #000027/#000030/
#000032 are all younger than 7d), so the sweep saw zero high-value
kernel-only work. Splitting τ_qa by audit_mode lets the cheap kernel
re-probe path (CP) run on a short cycle while the expensive LLM
re-witness path (STRICT/HYBRID/UNGROUNDED) keeps the long cycle.
bench/scripts/prometheus_sigma_sweep_dryrun.py: new build_tau_by_mode()
helper + per-mode CASE in iter_target_a_candidates; sweep_target_a now
takes the dict instead of a single seconds value. New CLI flag
--tau-qa-cp-days (default 1d); --tau-qa-days now scopes to LLM-witness
modes only (default 7d). Report renders the per-mode τ table in the
header and marks Findings 2 and 3 RESOLVED with their landing commits.
Makefile: PROMETHEUS_SWEEP_TAU_DAYS bumped to 7 (was 1, the prior
Finding-3 workaround); new PROMETHEUS_SWEEP_TAU_CP_DAYS=1 makevar.
bench/results/prometheus-sigma-sweep-dryrun-2026-05-10.md: regenerated
under the new defaults — 9 CP rows surface alongside 1,904 LLM-
witness candidates → 1,913 total Target A candidates → 1 ACCEPT,
2 MARGINAL, 205 REJECT, 271 DEFERRED chunks; 2 cache_drift vetoes
preserved end-to-end.
docs/tickets/ticket-000037 §22: Findings 2 + 3 marked RESOLVED with
landing-commit references; total dry-run cost line updated to the
new measurements (37.6 ms / 3,913 branches / 9.6 µs per branch).
russell@unturf.com
1f882df22c