zmigrate fails when discovering a transaction with an invalid consensus branch id

[nuttycom]

I got the following error when attempting to dump a current testnet wallet:

λ cargo run --features zcashd -- zcashd ./wallet.dat.20250327 > testnet_wallet.txt
   Compiling pqcrypto-internals v0.2.10
   Compiling secp256k1-sys v0.10.1
   Compiling secp256k1 v0.30.0
   Compiling bc-crypto v0.6.0
   Compiling bc-shamir v0.5.0
   Compiling sskr v0.5.0
   Compiling pqcrypto-mlkem v0.1.0
   Compiling pqcrypto-mldsa v0.1.1
   Compiling bc-components v0.17.0
   Compiling bc-envelope v0.24.0
   Compiling zewif v0.1.0 (https://github.com/nuttycom/zewif?rev=61c988fbfb6c3e74c5b98ba3da1cbc521b3967bd#61c988fb)
   Compiling zewif-zcashd v0.1.0 (https://github.com/nuttycom/zewif-zcashd?rev=dc7825b03e413596fcf301d9918df24dc012c22c#dc7825b0)
   Compiling zmigrate v0.1.0 (/home/nuttycom/work/zmigrate)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.01s
     Running `target/debug/zmigrate zcashd ./wallet.dat.20250327`
[src/zcashd_cmd.rs:32:38] file = "./wallet.dat.20250327"
---
🔴 Error: Parsing Zcashd dump

Caused by: Parsing transaction
Caused by: Parsing consensus_branch_id
Caused by: Unknown consensus branch ID: 928093729

This can be avoided by using the consensus branch IDs from the zcash_protocol crate, or using the transaction parser from the zcash_primitives crate.

[nuttycom]

Another possible cause for this error is that the consensus branch ID might be invalid (this is a somewhat-abused testnet wallet); it is probably a good idea to catch errors here and report them, but to allow the dump to proceed with errors; maybe the right approach is to have a "strict mode" that's on by default, but also add a "lenient mode" where errors are logged but aren't fatal.