Pairing the iOS Companion

TODO: this page will explain how to pair the iOS Companion app with the Hub on the same Wi-Fi network: discovery, QR / pair-code handshake, encryption-key exchange, and what the Companion can and cannot do when the Hub is asleep or off-network.

Owner: @andy. Cross-reference: CM031 (PWG iOS Companion) audit, and the update-distribution split between Hub (Sparkle) and Companion (App Store + StoreKit) – see memory/project_update_distribution_2026-04-23.md.