spec(0064): graduate coauthoring-native-surfaces v0.2.1 (operator approved)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

specs/coauthoring-native-surfaces.md

@@ -1,5 +1,5 @@
 ---
-status: draft
+status: graduated
 ---
 # Solution Design: Coediting Markdown with a Machine — a Native VS Code Experience
 
@@ -7,7 +7,7 @@ status: draft
 | --- | --- |
 | **Author(s)** | Ben Stull (with Claude) |
 | **Reviewers / approvers** | Ben Stull |
-| **Status** | `draft` |
+| **Status** | `graduated` |
 | **Version** | v0.2.1 |
 | **Source artifacts** | North-star architecture spec for human↔machine markdown coediting. Reference: VS Code's native review surfaces (SCM/QuickDiff, diff editor, Markdown preview, Comments). Inputs: the shipped plugin (F1–F12), the rung-2 feasibility spike (`vscode-cowriting-prototype`), `coauthoring-feasibility-spike.md`. Supersedes: none. |