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

ubuntu-based-kiosk.sh

@@ -22,6 +22,11 @@
 # - Requires a git checkout (not the no-git ZIP download option) and a
 #   clean working tree; a diverged local history fails the pull cleanly
 #   with a clear message instead of attempting an automatic merge.
+# - Full Reinstall dropped, not carried forward - it never worked
+#   reliably in this script either, 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 dedicated combined action needed.
 #
 # RELEASE v2.14.0 - install.sh Now Provisions a Kiosk From Scratch,
 #                    Not Just Manages an Existing One