# Phase 87 Summary

Status: implemented on `main`

## Goal

Close `v1.51` with targeted schema-tree regression coverage, compatibility
checks, and a fresh full-suite baseline.

## What Landed

- milestone-close verification for schema-tree contract and compatibility
  regression slices
- archived milestone packet under `.planning/milestones/v1.51-*`
- root `.planning/` state updated to `v1.51` closed

## Outcome

Phase `87` is complete.
`v1.51` is ready to close as a completed milestone.
