bidirectional empty tx panic repro - #1067
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A SignBidirectional request with an empty serialized_transaction reaches is_eip1559 (sign_bidirectional.rs), which indexes unsigned_rlp[0] without a length check and panics. Driven through the real lifecycle (run_supervised -> handle_chain_event -> process_respond_event -> advance_bidirectional_to_execution), the panic escapes the supervisor's `if let Err(..)` guard, which does not catch panics. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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