Dual-channel opening: consecutive failures (CHS-compatible, no streak
bump) plus windowed failure rate (two 30s buckets, min_calls guard).
429s bypass both channels as backpressure, and a probe hitting 429
releases instead of holding the lease. Open duration doubles per
rate/probe reopen up to max_cooldown_s, decaying after stable CLOSED.
record_success gains count_attempt so bad-result successes stay out of
the window.
Threshold auto-raise now uses per-source concurrency only (the M2
global-concurrency formula neutered the breaker at scale). Four new
optional keys: MIN_CALLS, FAIL_RATE, WINDOW_S, MAX_COOLDOWN_S.
Verifier adversarial cases showed pooled-room exemption could hide real
breaches: edge rows may only borrow from the neighbor on their own side,
and neighbor room is consumed globally so two windows cannot claim the
same slot. Also parse SQLite created_at as UTC, guard the dispatch
semaphore on progress-callback failure, and print a caveat that rescore
live checks reflect current db3 state.
RPM invariant now buckets by admit time on the Redis server clock,
exempts +/-2s boundary jitter, and excludes cache-hit rows that never
consumed a limiter slot. RSS sampling reports current ps RSS instead of
the monotonic ru_maxrss peak. Dispatch is paced by the concurrency
semaphore so --max-hours stays live and memory stays bounded. Add
--rescore RUN_ID to re-judge a finished run offline.
Classify empty completions as transient per human ruling (fixes flaky
real-gateway smoke and prevents caching empty responses), rename the
factory injection parameter gate to breaker per the frozen design,
rewrite the probe-entry cleanup without except BaseException, declare
python-dotenv explicitly, add a mid-backoff cancellation test, and
record all implementation errata in the design and architecture docs.
Includes config aggregation for multi-source env keys, from_env and
from_settings factories with explicit shared-backend injection,
gather_bounded, top-level exports, tightened import-linter layers with
the gate removed from the Makefile, and the finalized .env.example.
iomgaa