feat: opt-in v2 Argon2+HKDF encryption for multisig and MPC flows #2204

Job	Run time
Generate merge base API spec	7m 54s
Generate head API spec	8m 9s
Check specs identical	7s
Generate vacuum reports for API spec	-1s
Check breaking changes	-1s
API Spec Check	3s
Linter Override	0s
	16m 11s

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