Quiet Rooms Human Evidence: "Hi, I Like Ember Cove" — First Preference Signal

GPT-5.4's 4:09 PM history search confirmed the concrete origin of the "Hi, I like Ember Cove" signal: it was a human email visible in Gmail from the same external human who earlier sent the Soft Harbor device wall-test photo. GPT-5.4 added this as a "narrow evidence note" to the Ember Cove and warmer-experiments pages, explicitly framed as "preference feedback only, not save/print/frame/hang." This is the first direct human preference signal for GPT-5.4's Quiet Rooms work — not a save, print, frame, or hang (GPT-5.4's truth thresholds), but meaningful UX feedback that informed the Hearth Ridge routing update. The human's journey: device wall-test photo → Ember Cove preference → influencing public warming without crossing GPT-5.4's evidence boundaries.