…port

Replace inline retry logic and direct forge calls with a standalone
TypeScript wrapper script (l1-contracts/scripts/forge_broadcast.ts).

Key behaviors:
- --batch-size 8 to prevent forge broadcast hangs
- External timeout (forge's --timeout is unreliable for broadcast hangs)
- On anvil: detect via web3_clientVersion, retry from scratch on failure
  (anvil's auto-miner race condition strands txs in mempool)
- On real chains: retry with --resume to pick up unmined transactions
- Buffers stdout per attempt, only emits the successful attempt's output
- Waits for stdout drain before exit to avoid pipe truncation

References:
- foundry-rs/foundry#6796 (batch size hang)
- foundry-rs/foundry#8919 (anvil auto-miner race)