Drop Full Reinstall from the migration plan (docs only)

It never worked reliably in the legacy script, and the modular tool
already covers the same outcome more reliably as two already-tested
pieces run back to back: Complete Uninstall (Core Settings), then
./install.sh again to provision fresh. No code changes - nothing was
ever built for it in the modular tool, this just stops carrying it in
docs/comments as a pending gap.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VfsFSoRqfbRG7XAg5RoE7e

install.sh

@@ -16,8 +16,11 @@
 # run; kiosk-app/ and provision/files/ are real files in this git
 # checkout, so the modular Upgrade is `git pull` + re-running the same
 # provisioning steps, reused rather than reimplemented (see
-# menus/advanced_upgrade.sh). Full Reinstall remains legacy-only - it
-# has no equivalent here yet.
+# menus/advanced_upgrade.sh). Full Reinstall is deliberately not
+# carried forward - it never worked reliably in the legacy script, and
+# the same outcome is already available here, more reliably, as two
+# already-tested pieces run back to back: Complete Uninstall (Core
+# Settings), then ./install.sh again to provision fresh.
 #
 # Migrated so far, grouped the same way the legacy menu groups them:
 #   Core Settings: Sites & Page Timing, Display & Interaction, Timezone,