Targeted oracle-window compatibility fix; preserve the working automatic binding. Code/local tests only: no public deployment, live payments/signatures, backend or new signer.

Use https://imd.fun/docs/#intake-binding-an-answer-to-its-request and https://api.imd.fun/reads/skill/oracle-consumer, including OracleQuestion/OracleBoundConsumer. Replacing the existing prefix codec is NOT required.

1. requestVerdict currently sets toBlock=block.number-1. IMD requires >=5 blocks of depth when processing; its Ethereum Intake confirmation setting is only 3. Use an already-confirmed closing block (official example: native head minus 8). Require the candidate/delivery/retry start block <= that closing block before spending any reserved fee. Preserve exact signed-window equality, freshness, issuance/expiry and unique-ask checks; do not require this fixed window to end after the oracle trigger.

2. Use the question chain's block counter consistently at open, commit, delivery, retry, trigger and callback. Robinhood 4663 requires ArbSys(address(100)).arbBlockNumber(), not Solidity block.number. Fail closed on unsupported clock semantics before payment; never mix L1/L2 heights.

Add RED/GREEN regressions for insufficient depth, earliest permitted admission, distinct mocked L1/L2 heights, readiness boundaries, stale/future answers and retries. Prove early permissionless calls cannot spend reserves; valid approval still deploys only its exact candidate and wrong-question answers fail.

Preserve fees/recipients, escrow/refunds, immutable ArtifactV2, signer revocation/recovery, no NotPassed shopping, replay/reentrancy guards and compiler settings. Update SDK/UI readiness, ABIs and affected runtime pins/docs. Run full Foundry/SDK/UI, protocol vectors and isolated callback-gas checks; retain 200k callback and 24576-byte runtime caps. Save exact free body checks and distinguish local evidence from live proof.