Engram v2.8.0-pre.13 — Undo recent lifecycle actions

Undo recent lifecycle actions

Reverse archive/restore and newly reviewed pairwise or cluster consolidations for seven days. Reversals preserve audit/version history, archive only generated summaries, reject newer edits and remain idempotent. 67 backend tests and isolated restore of the production backup passed; migrations 013–017 applied twice without changing source counts or fingerprints.

Validated commit: 9f0eeee. All backend, web, mobile, Docker, DR and CodeQL checks passed; 67 backend tests passed in isolated PostgreSQL/Redis.

Cumulative prerelease. Apply the cumulative migrations documented for this prerelease. See docs/MEMORY-LIFECYCLE.md and docs/V2.8-PRERELEASES.md. v3 commercial/team work and native preview channel changes are excluded. Stable v2.8.0 publication and Blackwall deployment are approved for the end of the qualified sequence; this prerelease alone does not replace production.