Exact execution example

bijux vex ingest --doc "hello" --vector "[0.1,0.2]"
bijux vex materialize --execution-contract deterministic
bijux vex execute --artifact-id art-1 --vector "[0.1,0.2]" --top-k 1 \
  --execution-contract deterministic --execution-intent exact_validation --execution-mode strict

Expected:

• deterministic plan, no randomness sources
• execution artifact with no approximation report
• replay returns identical results

Failure example:

• If backend lacks deterministic support, command fails with InvariantError.