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Raise priority.session for HDMI/DisplayPort (1100) and USB (1050) ALSA outputs so the default sink follows dock plug/unplug; built-in analog wins again when externals disappear. Rules live in modules/nixos/dock-audio-rules.nix; checks.dock-audio covers the contract. Verified: V2 — flake check --no-build; checks.dock-audio green. V3 pending: HARDWARE-QUEUE #87 real HDMI/USB-dock hotplug.