chore: stage pre-existing community tier changes

Community tier auth, backup/restore, and test updates that were already
on this branch before the telemetry sprint. Includes updated telemetry
prompt test to match 3-option community tier flow.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "0.11.9.0",
+  "version": "0.11.10.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",