Added required imports for encryption testing: - std::error::Error (for error handling) - std::env (environment variable access) - std::io::{self, Write} (for I/O and stdin writing in password tests) - std::time::Duration (for timeouts) Updated workspace_root() to use imported 'env' for consistency. File compiles without warnings. Acceptance criteria: - All required std imports present: PASS - File compiles without errors: PASS - No unused import warnings: PASS Closes bf-4djms
- Add std::process::Stdio to imports in both test files - Update code to use imported Stdio instead of fully qualified paths - Verify compilation succeeds with cargo check Closes bf-3x4rp. Verification: notes/bf-3x4rp.md
