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Routes by host:\n * doi.org -> Crossref works API\n * arxiv -> export.arxiv.org Atom API\n * pubmed -> NCBI eutils esummary\n * All are public and keyless.\n */\nexport async function archivePaper(url: string): Promise> {\n const record: Record = {\n kind: \"paper\",\n originalUrl: url,\n archived_at: new Date().toISOString(),\n };\n const host = hostOf(url);\n record.host = host;\n record.url = url;\n if (!host) return record;\n\n if (host === \"doi.org\") {\n const doi = pathOf(url);\n if (doi) {\n record.doi = doi;\n await enrichCrossref(record, doi);\n }\n return record;\n }\n if (host === \"arxiv.org\" || host.endsWith(\".arxiv.org\")) {\n return await enrichArxiv(record, url);\n }\n if (host === \"pubmed.ncbi.nlm.nih.gov\") {\n return await enrichPubmed(record, url);\n }\n return record;\n}\n\n// ---------------------------------------------------------------------------\n// Crossref (DOI registration agency — free REST API)\n// ---------------------------------------------------------------------------\nasync function enrichCrossref(\n record: Record,\n doi: string,\n): Promise {\n try {\n const r = await fetch(`https://api.crossref.org/works/${encodeURIComponent(doi)}`, {\n headers: { \"user-agent\": USER_AGENT, accept: \"application/json\" },\n });\n if (!r.ok) return;\n const res = (await r.json()) as Record;\n const m = (res.message ?? {}) as Record;\n record.title = firstArray(m.title);\n record.authors = (m.author as Array> | undefined)\n ?.map((a) => [a.given, a.family].filter(Boolean).join(\" \") || String(a.name ?? \"\"))\n .filter(Boolean);\n record.journal = firstArray(m[\"container-title\"]);\n record.published = pickDate(m.published) ?? pickDate(m[\"published-online\"]) ??\n pickDate(m[\"published-print\"]) ?? pickDate(m.issued);\n record.publisher = m.publisher ?? null;\n record.volume = m.volume ?? null;\n record.issue = m.issue ?? null;\n record.pages = m.page ?? null;\n record.type = m.type ?? null;\n record.abstract = typeof m.abstract === \"string\" ? stripTags(m.abstract) : null;\n record.subjects = Array.isArray(m.subject) ? m.subject : undefined;\n record.license = (m.license as Array> | undefined)?.[0]?.URL ?? null;\n record.url = (m.URL as string) ?? record.url;\n record.paper_urls = (m.link as Array> | undefined)\n ?.map((l) => l.URL)\n .filter((v): v is string => typeof v === \"string\");\n } catch {\n /* best-effort */\n }\n}\n\n// ---------------------------------------------------------------------------\n// arXiv (export API returns Atom XML)\n// ---------------------------------------------------------------------------\nasync function enrichArxiv(\n record: Record,\n url: string,\n): Promise> {\n const m = url.match(/arxiv\\.org\\/(?:abs|pdf)\\/([^?#]+)/) ||\n url.match(/arxiv:([\\d.]+)/);\n const id = m ? m[1].replace(/\\.pdf$/, \"\").trim() : null;\n if (!id) return record;\n record.arxiv_id = id;\n record.url = `https://arxiv.org/abs/${id}`;\n\n try {\n const r = await fetch(`https://export.arxiv.org/api/query?id_list=${id}`, {\n headers: { \"user-agent\": USER_AGENT, accept: \"application/atom+xml\" },\n });\n if (!r.ok) return record;\n const xml = await r.text();\n const entry = firstEntry(xml) ?? \"\";\n record.title = stripTags(field(entry, \"title\"));\n const abstract = stripTags(field(entry, \"summary\"));\n if (abstract) record.abstract = abstract;\n const published = field(entry, \"published\");\n if (published) record.published = published.slice(0, 10);\n record.authors = Array.from(entry.matchAll(/([\\s\\S]*?)<\\/name>/g))\n .map((g) => stripTags(g[1]))\n .filter(Boolean);\n const doi = field(entry, \"arxiv:doi\");\n if (doi) record.doi = doi;\n record.journal = field(entry, \"arxiv:journal_ref\") || record.journal || null;\n } catch {\n /* best-effort */\n }\n return record;\n}\n\n// ---------------------------------------------------------------------------\n// PubMed (NCBI eutils — free for moderate use)\n// ---------------------------------------------------------------------------\nasync function enrichPubmed(\n record: Record,\n url: string,\n): Promise> {\n const pmid = url.match(/pubmed\\.ncbi\\.nlm\\.nih\\.gov\\/(\\d+)/)?.[1];\n if (!pmid) return record;\n record.pubmed_id = pmid;\n try {\n const r = await fetch(\n `https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esummary.fcgi?db=pubmed&id=${pmid}&retmode=json`,\n { headers: { \"user-agent\": USER_AGENT, accept: \"application/json\" } },\n );\n if (!r.ok) return record;\n const d = (await r.json()) as Record;\n const it = (d.result as Record)?.[pmid] as Record | undefined;\n if (!it) return record;\n record.title = it.title ?? null;\n record.published = it.pubdate ?? null;\n record.journal = it.fulljournalname ?? it.source ?? null;\n record.authors = (it.authors as Array> | undefined)\n ?.map((a) => a.name ?? null);\n record.type = \"journal-article\";\n const ids = (it.articleids as Array> | undefined) ?? 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