Verified-bridge demo recording script

This recording is an artifact-only CPU demo. It needs the bridge extra but does not need CUDA, model downloads, Ray or a verl installation.

Before recording

python -m pip install "miniverl[bridge]"
python scripts/prepare_verl_bridge_smoke.py --out _demo-source

Keep the terminal at least 110 columns wide. Start the recording after setup so the visible flow fits in 60–90 seconds.

Recording flow

# 0–10 s: show the exact compatibility target
miniverl --version
cat _demo-source/README.md

# 10–35 s: make the transactional standard-artifact bundle
miniverl export-verl --run _demo-source --target-verl v0.8.0 \
  --out _demo-bundle

# 35–65 s: inspect model, tokenizer, Parquet, config, reward, privacy and hashes
miniverl bridge doctor _demo-bundle --json

# 65–80 s: show the pin and the unsupported-semantics boundary
cat _demo-bundle/recipe/REQUIRED_VERL.txt
python -c "import json; p=json.load(open('_demo-bundle/provenance/compatibility-report.json')); print(p['unsupported_semantics']); print('launchable:', p['launchable']); print('distributed tested:', p['distributed_execution_tested'])"

# 80–90 s: show the portable tree
python -c "from pathlib import Path; print('\n'.join(p.as_posix() for p in sorted(Path('_demo-bundle').rglob('*')) if p.is_file()))"

Narration: “This proves that the handoff is pinned, structurally checked and checksummed. It does not prove a distributed verl job ran: the reward scaffold still fails closed and the bundle is not launchable.”

The release's stronger compatibility evidence additionally installs the exact official verl commit and uses OmegaConf plus PEFT to load the relevant surfaces. Its machine-readable record is generated/verl-bridge-smoke.json.