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Implement ALU and Level 1 verification - #32
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Implements all 11 ALU operations, zero flag, and deterministic handling of undefined function codes. Adds 6,928 directed, boundary, and deterministic randomized test vectors; enables strict ALU lint.
Validation: make ci passed, including Verilator lint and Icarus simulation. Three testbenches passed; four unrelated empty testbenches were skipped. Separate Verilator simulation hit Windows toolchain errors.
Fixes #1
Fixes #8