claim vscode-cowriting-plugin session 0027 (placeholder) + sessions.json entry

sessions/0027/SESSION-0027.0-TRANSCRIPT-2026-06-11T16-16--INPROGRESS.md

@@ -0,0 +1,24 @@
+# Session 0027.0 — Transcript
+
+> App: vscode-cowriting-plugin
+> Start: 2026-06-11T16-16 (PST)
+> Type: planning-and-executing
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0027 for vscode-cowriting-plugin. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0027.0-TRANSCRIPT-2026-06-11T16-16--<end>.md form at session end.
+
+## Launch prompt
+
+```
+plan-and-execute #22 (F7 intra-diagram mermaid diffing — node/edge-level diff
+beyond the whole-diagram "changed" badge), per Feature #22.
+
+```
+
+## Deferred decisions
+
+_Autonomous-mode low-confidence calls the driver made and would have
+liked operator input on. Appended as the session runs; surfaced at
+finalize. Empty if none._

sessions/sessions.json

@@ -76,5 +76,8 @@
   },
   "0026": {
     "title": ""
+  },
+  "0027": {
+    "title": ""
   }
 }