S2 HTTP 429 ingest failures

Semantic Scholar paperId left null. Fail-closed — do not invent ids. #177 novelty harness treats these as unknown.

Custom SQL query returning 4 rows (hide) 

select ts, lom_id, scheme, lookup, http_status, detail from ingest_error where scheme = 's2' and http_status = 429 order by ts desc

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tslom_idschemelookuphttp_statusdetail
2026-09-02T02:45:00Z   s2 https://api.semanticscholar.org/graph/v1/paper/ARXIV:2601.05930 429 HTTP 429; s2_paper_id left null
2026-09-02T00:57:56Z arxiv:2601.05930 s2 https://api.semanticscholar.org/graph/v1/paper/ARXIV:2601.05930 429 Semantic Scholar paperId lookup HTTP 429 during #164 ingest; field left null. Do not invent an id.
2026-09-01T22:52:00Z arxiv:2608.13940 s2 https://api.semanticscholar.org/graph/v1/paper/ARXIV:2608.13940 429 Semantic Scholar paperId lookup HTTP 429 during #161 ingest; field left null. Do not invent an id.
2026-09-01T22:28:00Z arxiv:2408.06292 s2 https://api.semanticscholar.org/graph/v1/paper/ARXIV:2408.06292 429 Semantic Scholar paperId lookup failed (HTTP 429) during #156 seed; field left null. Retry later; do not invent an id.