vgsp-sema r638: break the CE-watermark/wait-gate mutual citation - a channel whose unconsumed head entry is wait-gate held is a consumer-side wait, not a producer backlog; the watermark skips it while the candidate's operands are fully resolved and no decoded device write is pending, so the deferred launch forwards and its release installs (the r612/r636 streams chain: readback acquire op=3 pay=N sits behind the very launch whose release it wants, the two defer each other for the full 15 s cap and the copy runs ~20 s late); module param sema_mutual_skip (default 1, 0 = r636 behaviour)

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