Task 73922514186

wallet: relax external_signer flag constraints, add musig2 test (partial)

2026-05-01 10:35:32 completed 2025/07/external-signer-relax 8e7ea9997293df451e98e39300fc75b83329c08e

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[meta] record frozen commit

2025/07/external-signer-relax