Summary

• Adds a focused repository environment drift gate for SCIBASE issue #10.
• Compares baseline and release-candidate repository snapshots for component hash changes, Docker/Conda/kernel/runtime/package drift, stale reruns, low reproducibility confidence, and large-file Git LFS routing.
• Produces semantic-version impact, quarantine/rollback packets, reviewer tasks, JSON/Markdown/SVG outputs, and a short MP4 demo artifact.

/claim #10

Demo

• Short demo video: repository-environment-drift-gate/reports/demo.mp4
• SVG preview: repository-environment-drift-gate/reports/environment-drift.svg
• Audit packet: repository-environment-drift-gate/reports/drift-audit.json

Validation

• node repository-environment-drift-gate/test.js
• node repository-environment-drift-gate/demo.js
• node --check repository-environment-drift-gate/index.js
• node --check repository-environment-drift-gate/sample-data.js
• node --check repository-environment-drift-gate/demo.js
• node --check repository-environment-drift-gate/test.js
• git diff --check
• MP4 verification: imageio-ffmpeg decoded repository-environment-drift-gate/reports/demo.mp4 without errors

Notes

• Synthetic data only.
• No credentials, network calls, or external runtime dependencies in the module.
• This slice is distinct from broad repository ledgers, release embargo, notebook replay, schema migration, citation impact, API/export, and merge-queue governance submissions.