opt-in usage notes and a stats dashboard

Release builds ask in setup and Settings whether to send a short note when the app is opened and after each drive: the version, plus the Android version, phone model and cars people tick. Nothing runs in the background. Dev builds always send. The Cloudflare Worker in stats-worker/ stores the notes and serves a private dashboard with GitHub downloads alongside.

.gitignore

@@ -15,8 +15,6 @@ keystore.properties
 .cxx/
 
 # Testing
-/docs/cert-sweep.sh
-extraction/
 /cloned-repos
 docs-internal/
 
@@ -31,6 +29,4 @@ CLAUDE.md
 
 # Other
 archive/
-
-# Side project notes, kept out of the repo
-backseat-jury.md
+.wrangler/