Task 50528704021

key: use static context for libsecp256k1 calls where applicable

2025-09-16 19:59:43 aborted 202509-secp256k1_context_sign-only-if-necessary 1ff9e929489e625a603e8755b8efe849feda1f16

ccache_hitrate:

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test each commit

202509-secp256k1_context_sign-only-if-necessary