gas bench: Owlracle via proxy + Arb verify fix + per-chain catch-up cap - #1504
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…arb1.arbitrum.io + per-chain realizer catch-up cap
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Three post-review fixes.
Owlracle via rotating proxy — Owlracle guest tier is 10 req/h per IP; our 4-chain × 60s poll = 240 req/h from one VPS IP = permanent HTTP 403 within an hour. Route through the same webshare proxy pool the other harnesses use (HTTPS_PROXY env). Each request now comes from a different upstream IP, staying under the per-IP guest ceiling. No key needed, no user action.
Arbitrum verify RPC — was pointing to arbitrum.drpc.org which reroutes to 1rpc.io (rate-limits within 30s → 461 verify_fetch_err in <1h). Swap to arb1.arbitrum.io/rpc (Offchain Labs' own hosted RPC, genuinely independent of PublicNode/Node Fleet, sustains 5+ req/s clean).
Per-chain realizer catch-up cap — was hardcoded 5 blocks/tick, meaning Arbitrum (sub-second blocks, ~48 per 12s tick) was grading only ~10% of blocks and burying predictions in the buffer before eviction (buffer=99 pending). Now scales as max(5, realizedPollInterval / BlockTimeSec + 5), 60-block hard ceiling. ETH stays 5, Poly/Avax become 11, Arb becomes 17.
Verified locally
Build clean, vet clean.