# PFES-TR-002 — Artifact Retention Classes

## Class A — Canonical / Irreplaceable

Original vendor utilities, original dumps, unique hardware captures, validated engineering media, original specifications.

Default: keep.

## Class B — Historical Engineering Evidence

Major reports, important handoffs, decisive experiments, and sources that explain engineering evolution.

Default: archive unless fully redundant and migration review approves retirement.

## Class C — Regenerable Derived Artifacts

Analyzer outputs, inventories, generated reports, tables, manifests, and intermediate products reproducible from retained canonical inputs and documented tools.

Default: regenerate rather than archive, after reproducibility is verified.

## Class D — Temporary Artifacts

Scratch files, failed packaging attempts, superseded debug outputs, and low-value temporary comparisons.

Default: delete after migration and review.

## Safety Gate

Deletion requires:

1. Knowledge migration complete.
2. Trust and retention review complete.
3. Required source inputs retained.
4. Regeneration verified when applicable.
5. PFES repository state committed or preserved in a complete cumulative ZIP.
6. Optional pending-retirement quarantine completed.
