fix(chain): prevent overflow in `KeychainTxOutIndex::lookahead_to_target` - #2253

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CapThunder19 wants to merge 2 commits into

bitcoindevkit:masterfrom

CapThunder19:fix/lookahead-to-target-overflow

Commits on Aug 4, 2026

fix(chain): prevent overflow
CapThunder19
committed
3e76f04

Commits on Aug 19, 2026

fix(chain): inline lookahead overflow fix, drop redundant test
CapThunder19
committed
932fcc2