This PR adds a missing Requires header to BIP-0086:
Requires: 32, 341
Rationale:
- BIP-0086 explicitly defines derivation from a BIP-32 master private key.
- BIP-0086 also defines Taproot single-key output derivation and references BIP-341 semantics for output/script behavior.
Scope:
- Metadata-only change (no spec semantics changed).