---
phase: 86-schema-tree-doc-boundary
plan: 01
type: execute
wave: 1
depends_on:
  - phase-85
files_modified:
  - schemas/README.md
  - research/knowledge-hub/schemas/README.md
  - docs/architecture.md
  - research/knowledge-hub/tests/test_schema_tree_contracts.py
autonomous: true
requirements:
  - REQ-DOC-01
  - REQ-DOC-02
---

<objective>
Document the public-versus-runtime schema-tree boundary in durable docs and
guard that boundary with tests.
</objective>
