message: test(contracts): Assert lower bound on gas costs.
  Although we're quite happy when the CTC gets cheaper, we want to know about it
  and lock-in the savings.
diff: @@ -163,7 +163,12 @@ describe('[GAS BENCHMARK] CanonicalTransactionChain', () => {
  'Non-calldata overhead gas cost per transaction:',
  (gasUsed - fixedCalldataCost) / numTxs
  )
  - expectApprox(gasUsed, 1_605_796, { upperPercentDeviation: 0 })
  + expectApprox(gasUsed, 1_605_796, {
  + upperPercentDeviation: 0,
  + // Assert a lower bound of 1% reduction on gas cost. If your tests are breaking because your
  + // contracts are too efficient, consider updating the target value!
  + lowerPercentDeviation: 1,
  + })
  }).timeout(10_000_000)
  it('200 transactions in 200 contexts', async () => {
  @@ -206,7 +211,12 @@ describe('[GAS BENCHMARK] CanonicalTransactionChain', () => {
  'Non-calldata overhead gas cost per transaction:',
  (gasUsed - fixedCalldataCost) / numTxs
  )
  - expectApprox(gasUsed, 1_739_811, { upperPercentDeviation: 0 })
  + expectApprox(gasUsed, 1_739_811, {
  + upperPercentDeviation: 0,
  + // Assert a lower bound of 1% reduction on gas cost. If your tests are breaking because your
  + // contracts are too efficient, consider updating the target value!
  + lowerPercentDeviation: 1,
  + })
  }).timeout(10_000_000)
  it('100 Sequencer transactions and 100 Queue transactions in 100 contexts', async () => {
  @@ -287,7 +297,12 @@ describe('[GAS BENCHMARK] CanonicalTransactionChain', () => {
  console.log('Benchmark complete.')
  console.log('Gas used:', gasUsed)
  - expectApprox(gasUsed, 217_615, { upperPercentDeviation: 0 })
  + expectApprox(gasUsed, 217_615, {
  + upperPercentDeviation: 0,
  + // Assert a lower bound of 1% reduction on gas cost. If your tests are breaking because your
  + // contracts are too efficient, consider updating the target value!
  + lowerPercentDeviation: 1,
  + })
  })
  it('cost to enqueue a transaction below the prepaid threshold', async () => {
  @@ -304,7 +319,12 @@ describe('[GAS BENCHMARK] CanonicalTransactionChain', () => {
  console.log('Benchmark complete.')
  console.log('Gas used:', gasUsed)
  - expectApprox(gasUsed, 156_711, { upperPercentDeviation: 0 })
  + expectApprox(gasUsed, 156_711, {
  + upperPercentDeviation: 0,
  + // Assert a lower bound of 1% reduction on gas cost. If your tests are breaking because your
  + // contracts are too efficient, consider updating the target value!
  + lowerPercentDeviation: 1,
  + })
  })
  })
  })
  