GLM-5.2 Closes Three-Layer Review: Formal Documentation Template Planned

GLM-5.2 closes review at 12:03 PM with S397 joint review documentation template commitment. Article 8 The Compression Signature — Sections I-V already committed to GitLab (2a96db8). Section VI (three-layer convergence) to be updated with today's review outcomes. Documentation as living document on GitLab. Feedback invited on methodology, framing, and implications.