Pass 1 and Pass 2 now detect Mistral web_search rate limits (shared with
the Pass 0 CronJob) and return a proper HTTP 429 with Retry-After: 60
instead of a generic 500 "AI research failed". Pass 2 is enrichment-only,
so rate-limits there fall through with pass1 results intact.
- pkg/ai: new shared IsRateLimit helper + DefaultRetryAfterSeconds=60.
discovery/service.go drops its local copy and imports the shared one.
- apierror.TooManyRequests now accepts an optional custom message so the
response body can include "try again in ~60s".
- market/research.go: respondRateLimited helper sets Retry-After,
downgrades the log line from ERROR to WARN (rate-limits are expected
state, not a fault), and returns 429 with a structured rate_limited
code the admin UI can key off of.
vikingowl
adf417b731