Closes four gaps in the initial Phase 1 landing (commit f625cac):
1. §14 row 4 — Hermes-saturation guard. `hermes_utilization` was on
the input contract but never consumed. Now: `utilization >=
budget` → DEFERRED with HERMES_SATURATED note + advisory event
carrying (utilization, budget) for Phase 2 audit. Three new
tests (saturation-equal, saturation-overflow, headroom-exists).
2. §13 step 11 — falsification-fixture proposal emission.
New `FalsificationFixtureProposal` dataclass; controller now
emits one per branch whose `witness_divergence >=
falsification_divergence_threshold` (weight-tunable, default
0.5). Emission fires BEFORE the all-vetoed cascade so vetoed-
AND-diverged branches still surface as 5F-fixture candidates
per #000025. Four new tests (high-divergence emits, low-
divergence stays silent, threshold is weight-tunable, vetoed-
diverged emits anyway).
3. Entropy + memory gating moved from module-level constants
(`H_LOW=0.3`, `H_HIGH=0.7`, `KAPPA_MEMORY=0.5`) to weight
fields (`h_low`, `h_high`, `kappa_memory`). Constants stay as
back-compat exports; defaults match exactly so byte-identical
behavior when neither override fires. Three new tests
(h_low/h_high tunable, kappa_memory tunable, back-compat
match).
4. Veto-class cascade hardening. Added explicit tests for the
`replay_window_unbounded` → ESCALATE path and the
`soft_hash_signal` → QUARANTINE path (§6 + §14 documented but
previously untested). Plus tests for the §6 fail-loud
priority ordering: ESCALATE > QUARANTINE > REJECT when mixed.
Dry-run regenerated against ~/.arborist/shards corpus:
Target A at τ_qa=1d surfaces **576 FalsificationFixture
proposals** from witness_divergence >= 0.5 (24% of swept
candidates). These rows are now an actionable funnel for 5F
fixture mining under #000025 §3.
Module: arborist/substrate/prometheus.py (+117 LOC, 899 total)
Tests: tests/test_prometheus.py (+196 LOC, 22 → 36 tests)
Dryrun: bench/scripts/prometheus_sigma_sweep_dryrun.py +
bench/results/prometheus-sigma-sweep-dryrun-2026-05-10.md
track the new falsification_proposals_total counter.
Full suite: 2326 passed, 37 skipped (+14 net from the new tests).
russell@unturf.com
f9f5ae459b