Task 96374065084

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

2026-08-20 09:08:32 completed 2025/07/external-signer-relax 2e39d5c032e3f703d529ef23189fa2e7f3112d1c

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[meta] record frozen commit

2025/07/external-signer-relax