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Question type: Quantum Entry: Threshold Readout, measurement, probability appearance, and entanglement. Canonical lane: start at V05-5.1 (What Quantum Really Is: Change the Base Map Before Memorizing the Equations). Bridge if needed: V05-5.2, V09-9.15. Default retrieval profile: explain_profile. Forbidden shortcut: Do not treat quantum readout as pure mystery-first postulate language before the threshold chain is installed.