HAL: refactor salt_root functions #1717
Merged
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Centralizes salt root access behind the HAL abstraction, enabling full test isolation without C memory dependencies.
TestingHal initializes with a default salt root to preserve existing test behavior without manual setup in each test.
The 2 rust_salt_hash_data tests keep using mock_memory() + C-backed salt root because the extern "C" shim internally constructs BitBox02Hal—these tests verify the FFI path works.