import importlib.util,json
from preflight import R,g,HEAD
s=importlib.util.spec_from_file_location('prior_build','/tmp/codex/ltb1021/2026-09-12_contextra-rtp-anchor_r01/build.py')
p=importlib.util.module_from_spec(s);s.loader.exec_module(p)
p.EDITED=['native/frame_metadata/Makefile','tests/sdk_rtp_loader_probe.py']
if __name__=='__main__':
    v=json.loads((R/'source-verify.json').read_text());assert v=={'loader':0,'sdk_copy':0}
    (R/'verify.json').write_text(json.dumps(dict(errors=0,failures=0,sdk=0)))
    # Existing builder keeps disk/time/CAS/source pin contracts. Unique tag includes the new change hash.
    p.main()