ThinkPad E14 Gen 7: no sound from speakers or mic on Windows 10? It's the Windows 11-only audio APOs

An evidence-driven teardown of two audio failures on a Windows 11-only ThinkPad E14 Gen 7 (Intel Arrow Lake, type 21SX) downgraded to Windows 10 — silent speakers (an APO class the driver never registered) and a dead microphone (an APO that crashes audiodg) — diagnosed with WASAPI HRESULTs and fixed with a registry merge and a driver removal.

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