Compares innr RB 285 C (this project's own existing project-plan.md pick,
router-capable, confirmed zigbee2mqtt support), IKEA TRADFRI (cheapest but
not reliably on Amazon), and Sengled (cheap but not a Zigbee router, which
matters for whole-house mesh coverage) — picks innr. Count is a rough ~16
placeholder pending an actual per-room fixture count. Adds it to the
Lighting/Summed totals/Need/Price estimate sections; new subtotal
~€1,729-2,045.