flaky test: `TestSuperchain`

**Claude:** Reporting a flaky test.

**Test:** `TestSuperchain` (and subtest `TestSuperchain/mainnet`)
**Package:** `github.com/ethereum-optimism/optimism/op-deployer/pkg/deployer/bootstrap`
**CI job:** `go-tests-short`
**Flake count:** 45 (via CircleCI Insights as of 2026-03-17)
**Date:** 2026-03-17

Same package as TestImplementations — may share a common root cause. Investigation in progress.

Start with TestSuperchain and its mainnet subtest in github.com/ethereum-optimism/optimism/op-deployer/pkg/deployer/bootstrap, running the go-tests-short job or the package tests to reproduce the flake. Compare the investigation with TestImplementations in the same package. Done means identifying and addressing the common root cause so TestSuperchain runs reliably.

Written by the indexing model from the issue text.