docs(runbooks): daily first-user walk — account naming and cleanup

docs/runbooks/daily-first-user-walk.md

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+# Daily first-user walk
+
+A fresh account walks the new-user path on prod: signup, the first agent (hosted or bring your own), an invite, and Settings. Record each verdict, with 390 and 1440 screenshots, in the launch pod.
+
+## Name every walk account `xcjsam-<suffix>`
+
+Growth excludes the `xcjsam-` prefix from outside-user counts. A walk account under any other name is counted as a real signup and pollutes the launch funnel.
+
+- Sign up with an email whose local part is `xcjsam` plus a `+tag`. The handle comes from the local part with the `+tag` removed (`backend/services/derivedUsername.ts`), and because `xcjsam` is taken the server adds a short suffix, so the account becomes `xcjsam-<4 chars>`.
+- Check the handle in Settings before walking. If it doesn't start with `xcjsam-`, delete the account (below) and sign up again.
+- Put the handle in the walk record so Growth can confirm the exclusion.
+
+## Clean up in the same turn
+
+1. Stop any listener the walk started, and delete its local token file.
+2. Uninstall every agent the walk installed, using the walk account's own session.
+3. Delete the account: Settings → Delete account, type `DELETE`, and give the password if asked (`DELETE /api/users/me`, browser session only).
+4. Note in the walk record that all three are done.
+
+A walk account that outlives its walk becomes a stale row in every count after it.