Add full Cursor chat archive for Documents/repos workspaces.

Includes global state.vscdb, per-repo transcripts, workspace storage,
composer exports, and restore scripts for a new machine.

Co-authored-by: Cursor <cursoragent@cursor.com>

restore-config.example.json

@@ -0,0 +1,4 @@
+{
+  "new_home": "/home/YOUR_USER",
+  "new_repos_root": "/home/YOUR_USER/Documents/repos"
+}