ARTEX_NOISE_PROFILE = off | quiet | balanced | aggressive drives one shared
governor used by WebFetch, the http custom tools and the enrich probe: token
bucket, bounded jitter and concurrency per host, a global cap, backoff on
429/503 honouring Retry-After with bounded retries, per-task coalescing and
a short cache of identical GETs (never POST/PUT/PATCH/DELETE), and a
per-host noise log line each minute. Off (the default) is a strict
passthrough.
Removes the fixed artex-enrich/1.0 User-Agent; ARTEX_TARGET_USER_AGENT sets
one under a profile (empty = unchanged).
BaaRai