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- feat!: remove DBLP and retry rate-limited Semantic Scholar requests
BREAKING CHANGE: DBLP is removed. "dblp" is no longer a valid source for findVerifiedPapers, and searches cover 8 databases. dblp.org serves a bot-check page to API clients instead of JSON, so every DBLP search failed and added an error to every response. Computer-science papers with DOIs are still found through CrossRef and OpenAlex.
Semantic Scholar: a 429 on a request without an API key is now retried once after one second, since the shared anonymous quota is often only briefly full. If the retry is also limited, the RATE_LIMITED error is reported as before. Requests with SEMANTIC_SCHOLAR_API_KEY are not retried.