Persist account state snapshot and switch account-value reporting to aggregate usage totals

[Copilot]

show-account-values.py now supports a true two-pass flow for test runs: first pass persists per-account balance/nonce state, and subsequent pass reports only aggregate activity across accounts. Output is reduced to the required high-signal metrics: account count, total gas-used proxy, and total transactions done.

• Snapshot-backed two-pass accounting

  • Added JSON snapshot persistence for per-account:
    • balance_wei
    • nonce
  • Introduced --snapshot-file (default: account-values-snapshot.json) to control snapshot location.
  • Existing workflow usage (before/after test) now naturally uses the saved baseline from the first invocation.

• Aggregate-only reporting

  • Removed per-address balance/nonce table output.
  • Script now prints only:
    • Accounts: <n>
    • Total gas used (wei): <sum(previous_balance - current_balance)>
    • Total transactions done: <sum(current_nonce - previous_nonce)>

• Delta calculation behavior

  • Deltas are computed only for addresses present in the prior snapshot.
  • First run establishes baseline and writes snapshot; later runs compute cross-run deltas.

• Focused regression coverage

  • Added a unit test for:
    • first-run snapshot creation + zero deltas
    • second-run aggregate delta computation from stored snapshot

# output shape after change
print(f"Accounts: {len(current_values)}")
print(f"Total gas used (wei): {total_gas_used_wei}")
print(f"Total transactions done: {total_transactions_done}")

# snapshot write for next pass
with open(args.snapshot_file, "w") as f:
    json.dump(current_values, f, indent=2)

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