Wikipedia search no longer floods the log with per-title tracebacks when the MediaWiki API rate-limits a query — the engine now detects the JSON-decode error pattern, logs a single warning, and bails out of the batch with whatever previews it collected. Fetched pages that come back empty (paywalls, JS-only SPAs, blank 200s) and LLM extractions that return an empty summary now short-circuit to `NOT RELEVANT` without locking the URL into the citation collector, so the agent is free to re-fetch it later under a different focus.
