Certified via existing extensive pre-session coverage (10 tests in
spi_engine_tb.v, CDC ratio-variation test in spi_slave_tb.v, explicit
unknown-opcode-as-NOP handling), re-confirmed passing in Phase 0.
Targeted check given this campaign's recurring pattern (missing
zero-value guards, BUG-002 through 006): WRITE_RAM/READ_RAM len=0 IS
explicitly guarded (rtl/spi_engine.v:817, transitions to ST_IGNORE) --
confirms the project does not systematically lack these guards, the
gap is specific to the modules already flagged.
No new bugs found in this aspect.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v
