Outcome contract

shadow.outcome.v1 contains one Outcome, optional A/B/C question, bounded decision receipts, and relative proof references. The deterministic validator is:

python3 scripts/shadow-outcome-validate.py \
  --input examples/outcome-choice/example.json

It exits 0 for valid, 1 for invalid, and 2 for invocation or I/O failure. The schema intentionally excludes provider, model, prompt, transcript, credential, command, session, and absolute-path fields.