routes/meters.js already imported lib/mqtt.js and lib/history.js in an
earlier uncommitted change; a prior commit staged the whole meters.js
file (picking up those imports) without staging the modules themselves,
crashing production with ERR_MODULE_NOT_FOUND. Completing the commit:
package.json (mqtt dependency), index.js (wires connectMqtt/startScheduler,
both already error-guarded if the broker isn't reachable), and the three
lib files themselves.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>