claim vscode-cowriting-plugin session 0019 (placeholder) + sessions.json entry

sessions/0019/SESSION-0019.0-TRANSCRIPT-2026-06-11T07-41--INPROGRESS.md

@@ -0,0 +1,23 @@
+# Session 0019.0 — Transcript
+
+> App: vscode-cowriting-plugin
+> Start: 2026-06-11T07-41 (PST)
+> Type: planning-and-executing
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0019 for vscode-cowriting-plugin. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0019.0-TRANSCRIPT-2026-06-11T07-41--<end>.md form at session end.
+
+## Launch prompt
+
+```
+Broaden F6 diff-view toggle to work on ANY file (and untitled buffers), not just workspace files. Decisions: uniform global storage keyed by URI hash; untitled buffers in-memory only; F6 gets its own diffable predicate decoupled from F2's isTracked. Continuation of #17.
+
+```
+
+## 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

@@ -52,5 +52,8 @@
   },
   "0018": {
     "title": ""
+  },
+  "0019": {
+    "title": ""
   }
 }