cem-interop-runner

Native CEM 0.1 interop runner

cem-interop-runner is the active Corvint-free external consumer harness for the frozen interop/cem-0.1 packet. It uses only the Go standard library and exposes the same workflow:

go run ./tools/cem-interop-runner doctor
go run ./tools/cem-interop-runner start --lane consumer --output /absolute/private/observation.json
go run ./tools/cem-interop-runner consumer --implementation /absolute/path/to/consumer --observation /absolute/private/observation.json
go run ./tools/cem-interop-runner consumer --retry --implementation /absolute/path/to/consumer --observation /absolute/private/observation.json
go run ./tools/cem-interop-runner inspect --observation /absolute/private/observation.json

The runner verifies the frozen manifest and all 51 artifact digests before reading the consumer, then snapshots all case inputs and runs the ordered 7 valid, 19 invalid, and 6 drift cases in fresh private directories. Observations use an owner-only lock, bounded CAS updates, atomic publication, and at most one explicit retry.

interop/cem-0.1/runner.py remains unchanged because its bytes belong to the historical packet identity. It is retired from active execution. Receipts created with its packet digest remain historical evidence and are not current native-runner receipts. The native runner does not claim external qualification, producer support, sealed qualification, or the documented multi-evidence extension.