---
phase: 87-closure-and-regression-audit
plan: 01
type: execute
wave: 1
depends_on:
  - phase-86
files_modified:
  - .planning/STATE.md
  - .planning/ROADMAP.md
  - .planning/REQUIREMENTS.md
  - .planning/MILESTONE-CONTEXT.md
  - .planning/MILESTONES.md
  - .planning/PROJECT.md
  - .planning/milestones/v1.51-ROADMAP.md
  - .planning/milestones/v1.51-REQUIREMENTS.md
  - .planning/milestones/v1.51-MILESTONE-AUDIT.md
autonomous: true
requirements:
  - REQ-VERIFY-01
---

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