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Repair the vendored Ibex RTL so an in-flight multi-cycle RV32Zcmp compressed expansion is discarded when the IF stage redirects to an exception handler. Preserve normal Zcmp expansion and the parameterized decoder interface.

Work in `/app/vendor/project`. The source tree is intentionally pre-fix. Add the necessary decoder flush input, connect it from the IF-stage exception redirect, and give the flush priority over the state-machine transition. Then run:

    python3 /app/vendor/project/rtl_regression.py --output /app/output.json

The command must exit successfully and produce `/app/output.json` matching the public schema in `/app/vendor/project/output_contract.json`. Do not add a replacement evaluator or bypass the existing RTL modules.