refactor: remove unused imports in bip-0360 rust implementation #2104

1. 
   strmfos commented at 1:09 pm on February 15, 2026: contributor

   сleaned up unused imports across the codebase:

   • removed std::env from schnorr_example.rs and slh_dsa_key_gen.rs
   • removed unused imports from slh_dsa_verification_example.rs (std::env, log::info, once_cell, bitcoin::hashes)
   • removed Algorithm from data_structures.rs
   • removed MixedLeafInfo from lib.rs
   • removed tagged_hash from test files (p2mr_construction.rs, p2mr_pqc_construction.rs)

   all test pass

2. refactor: remove unused imports in bip-0360 rust implementation 4e17fa9fee

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strmfos