Cancel any inflight block building when stopping the sequencer, to av…

op-node: protocol versions signal handling

contracts-bedrock: ProtocolVersions contract

Updates the implementation salt. Without this change, the
deployments fail on Goerli. They work on the devnet so something
must be different between the devnet and the live network.
This change will ensure that there is less config to manage
in the superchain registry by having a canonical address for
each semver version.
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

fix(indexer): Fix tygo check in ci

op-challenger: Fix recording of last step index

feat: Head Subscriptions

op-challenger: Add e2e test for the poisoned post-state case

Record the same last step value to disk as we store in memory (should be one less than the final state Step value).
Write the proof for the last step to disk to avoid needing to regenerate it even once.

Merge pull request #7212 from ethereum-optimism/dependabot/npm_and_yarn/typescript-eslint/parser-6.7.0

build(deps-dev): bump @typescript-eslint/parser from 5.60.1 to 6.7.0

build(deps): bump chai and @types/chai

txmgr: Do not update nonce on failed gas estimate

op-e2e: fix outdated TestRequiredProtocolVersionChangeAndHalt config tweak, just purely rely on rollup-config defaults of setup