Live-checked the flow export directly: NetBox's dead switch rule and
mapper function have actually been removed since this doc was written
(16->15 switch rules, 15->14 routed apps) - the doc's own 'debt' claim
was half-stale, since only Kestra's dead webhook route remains.
Corrected all four places this count appeared (routing-table example,
two screenshot captions, one diagram's alt-text). Also fixed the
mqtt-monitor.sh check-count example: raw grep now returns 23 due to a
companion state file (failed_units_current) for an existing check, not
a genuinely new 23rd check - reworded so the total (23) stays accurate
without implying a new check was silently added. Mosquitto broker
config/passwords/ACL and the Inventory Parse Function code both
confirmed unchanged.