Issue: L1 watcher crashes or corrupts state on transient errors

Issue: L1 watcher crashes or corrupts state on transient errors: a task in LegoFlow-SWE (Harbor dataset). The L1 watcher process currently does not handle errors from block data retrieval gracefully. If the underlying provider.get block call encounters a network issue, rate‑limit response, or…

The task

The L1 watcher process currently does not handle errors from block data retrieval gracefully. If the underlying `provider.get_block` call encounters a network issue, rate‑limit response, or similar transient failure, the entire watcher task terminates. There is no retry mechanism.

Part of Lego-X/LegoFlow-SWE.